SCRAPIE USA

Transmissible Spongiform Encephalopathy TSE Prion PrP sheep and goats

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Location: BACLIFF, Texas, United States

My mother was murdered by what I call corporate and political homicide i.e. FOR PROFIT! she died from a rare phenotype of CJD i.e. the Heidenhain Variant of Creutzfeldt Jakob Disease i.e. sporadic, simply meaning from unknown route and source. I have simply been trying to validate her death DOD 12/14/97 with the truth. There is a route, and there is a source. There are many here in the USA. WE must make CJD and all human TSE, of all age groups 'reportable' Nationally and Internationally, with a written CJD questionnaire asking real questions pertaining to route and source of this agent. Friendly fire has the potential to play a huge role in the continued transmission of this agent via the medical, dental, and surgical arena. We must not flounder any longer. ...TSS

Saturday, November 14, 2009

Isolation of two distinct prion strains from a scrapie-affected sheep

Isolation of two distinct prion strains from a scrapie-affected sheep

Kentaro Masujin • Yujing Shu • Hiroyuki Okada • Yuichi Matsuura • Yoshifumi Iwamaru • Morikazu Imamura • Shirou Mohri • Takashi Yokoyama Received: 27 July 2009 / Accepted: 29 September 2009 / Published online: 30 October 2009  The Author(s) 2009.

This article is published with open access at Springerlink.com Abstract

We performed a transmission study using mice to clarify the characteristics of the most recent case of scrapie in Japan. The mice that were inoculated with the brain homogenate from a scrapie-affected sheep developed progressive neurological disease, and one of the scrapieaffected mice showed unique clinical signs during primary transmission. This mouse developed obesity, polydipsia, and polyuria. In contrast, the other affected mice exhibited weight loss and hypokinesia. In subsequent passages, the mice showed distinct characteristic scrapie phenotypes. This finding may prove that different prion strains coexist in a naturally affected sheep with scrapie.

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Different types of PrPSc (types 1 and 2) were reported to co-exist in a case of sporadic Creutzfeldt–Jacob disease (sCJD) [15]. Scrapie in sheep is also proposed to be caused by mixed populations of different prion strains [16, 17]. In the present study, different prion strains were isolated from the brain of a scrapie-affected sheep during the primary transmission studies. In the previously reported CJD case, the PrPcore sizes of the two strains were different. In contrast, in the case reported in this study, although their PrPcore sizes were not different, the prions of the two strains showed distinct biological characteristics. In addition, this result showed that a transmission study using experimental animals is a useful approach for the isolation and characterization of prion strains. New TSE strains are believed to emerge due to mutations caused by differences in the primary PrP sequences of the host and the inoculum [17]. We observed that 3 out of 31 mice showed the characteristic clinical signs of the Ka/O strain in repeat trials of Ka/scrapie transmission (data not shown). This data indicates that the Ka/O strain shows a constant occurrence rate of 6–9%. Therefore, our findings may indicate that mixed prion populations exist in a strain in the brain of Ka/scrapie-affected sheep, while the Ka/O strain seemed to be the less dominant strain, which may have been inefficiently selected during interspecies transmission.

In this study, we examined the biological characteristics of prions in the most recent case of scrapie in Japan. On the basis of our results, we conclude that multiple prion strains coexist in a scrapie-affected sheep. To elucidate the molecular epidemiology of prion diseases, further studies should be conducted to clarify the mechanism underlying the emergence of new prion strains.

http://www.springerlink.com/content/f172377214414353/fulltext.pdf


Design and construction of diverse mammalian prion strains

David W. Colbya, Kurt Gilesa,b, Giuseppe Legnamea,b,1, Holger Willea,b, Ilia V. Baskakova,2, Stephen J. DeArmonda,c and Stanley B. Prusinera,b,3 + Author Affiliations

aInstitute for Neurodegenerative Diseases and Departments of bNeurology and cPathology, University of California, San Francisco, CA 94143 •?1Present address: Neurobiology Sector, Scuola Internazionale Superiore di Studi Avanzati, Trieste 34151, Italy.

•?2Present address: Medical Biotechnology Center, University of Maryland Biotechnology Institute, Baltimore, MD 21201.

Contributed by Stanley B. Prusiner, September 11, 2009 (sent for review September 2, 2009)

Abstract

Prions are infectious proteins that encipher biological information within their conformations; variations in these conformations dictate different prion strains. Toward elucidating the molecular language of prion protein (PrP) conformations, we produced an array of recombinant PrP amyloids with varying conformational stabilities. In mice, the most stable amyloids produced the most stable prion strains that exhibited the longest incubation times, whereas more labile amyloids generated less stable strains and shorter incubation times. The direct relationship between stability and incubation time of prion strains suggests that labile prions are more fit, in that they accumulate more rapidly and thus kill the host faster. Although incubation times can be changed by altering the PrP expression level, PrP sequence, prion dose, or route of inoculation, we report here the ability to modify the incubation time predictably in mice by modulating the prion conformation.

synthetic prions stability amyloid neurodegeneration conformation Footnotes 3

To whom correspondence should be addressed. E-mail: stanley@ind.ucsf.eduAuthor contributions: D.W.C., G.L., and S.B.P. designed research; D.W.C., K.G., H.W., I.V.B., and S.J.D. performed research; D.W.C., K.G., H.W., S.J.D., and S.B.P. analyzed data; and D.W.C., S.J.D., and S.B.P. wrote the paper. The authors declare no conflict of interest.

http://www.pnas.org/content/early/2009/11/12/0910350106.abstract?etoc=



Scientific Opinion on genetic TSE resistance in goats in all European Union Member States Question number: EFSA-Q-2009-00448

Adopted: 21 October 2009 Summary (0.1Mb)

Opinion (0.3Mb)

Summary

Following a request from the European Commission, the Panel on Biological Hazards (BIOHAZ) was asked to deliver a scientific opinion on genetic resistance to Transmissible Spongiform Encephalopathies (TSE) in goats.

For a first part of that request, the BIOHAZ Panel adopted on 5th March 2009 a scientific opinion on the scientific validity of a study carried out by the Cypriot authorities under the auspices of the Community Reference Laboratory (CRL) for TSEs. That scientific opinion also indicated to what extent the information contained in the study could be used as relevant tools to control Classical scrapie in Cyprus.

In the current scientific opinion the BIOHAZ Panel addresses genetic resistance as a relevant tool for breeding for resistance to all TSEs of goats (including Atypical scrapie and BSE) in all the Member States (MSs) (except for Classical scrapie in Cyprus).

To carry out this task, available scientific knowledge on genetic TSE resistance in goats in the EU is reviewed, addressing those PRNP polymorphisms for which a capacity to provide resistance to TSEs in goats has been (or is being) investigated. Details tailored to the different TSEs found in this small ruminants (i.e. Classical scrapie, Atypical scrapie and BSE) are also considered and presented.

Further on, the feasibility of a large-scale breeding program in animal populations would need to be supported by a sound logistical and technical infrastructure in any given territory. In order to collect preliminary data that could help to evaluate the specific situation in the different EU MSs, a questionnaire was developed and circulated among the EFSA BSE-TSE Network. The results of the analysis of the replies received are also presented herewith.

The BIOHAZ Panel concluded that there are encouraging but as yet incomplete data to consider supporting a breeding programme for resistance in goats against Classical scrapie in all EU MSs, and ongoing studies are expected to provide a more robust scientific background in the coming years. On the other hand, at this moment there are not enough data available to consider supporting a breeding programme for resistance against Atypical scrapie and BSE in goats in all EU MSs. Experiments are ongoing on BSE in goats and results will be available in the next years. Furthermore, there are limited data suggesting that an allele (H154) might confer resistance to Classical scrapie but increase susceptibility to Atypical scrapie.

The frequency of the wild type allele, which is known to confer susceptibility to Classical scrapie, is high in all goat breeds considered. Thus, selection for putative resistance alleles will be slow, complicated and highly dependent on breeding structure.

It is acknowledged that any large scale breeding programme for TSE resistance in goats must take into consideration key elements related to the current dissemination of potentially TSE protective polymorphisms in the goat population of each EU MS and the characterisation of the real protection provided by those polymorphisms. At present, only a few EU MSs seem to have in place the necessary elements to introduce a breeding for resistance programme for Classical scrapie in goats.

The BIOHAZ Panel makes a series of recommendations on new investigations in order to assess the efficacy of breeding for the candidate PRNP alleles as a mean to control TSEs in goats. Furthermore, research on the possible adverse effects of the candidate PRNP polymorphisms on other production traits should be encouraged. In addition, it is recommended that a breeding for resistance programme for TSE in goats is first implemented in the seven EU MSs with the largest goat population as this would have the most impact.

Published: 9 November 2009

http://www.efsa.europa.eu/EFSA/efsa_locale-1178620753812_1211903027156.htm?WT.mc_id=EFSAHL01&emt=1


OPINION

http://www.efsa.europa.eu/EFSA/Scientific_Opinion/1371,0.pdf?ssbinary=true


Tuesday, November 10, 2009

A retrospective immunohistochemical study reveals atypical scrapie has existed in the United Kingdom since at least 1987

Brief Research Reports

http://nor-98.blogspot.com/2009/11/retrospective-immunohistochemical-study.html


Coexistence of multiple PrPSc types in individuals with Creutzfeldt-Jakob disease

Magdalini Polymenidou, Katharina Stoeck, Markus Glatzel, Martin Vey, Anne Bellon, and Adriano Aguzzi

Summary

Background The molecular typing of sporadic Creutzfeldt-Jakob disease (CJD) is based on the size and glycoform ratio of protease-resistant prion protein (PrPSc), and on PRNP haplotype. On digestion with proteinase K, type 1 and type 2 PrPSc display unglycosylated core fragments of 21 kDa and 19 kDa, resulting from cleavage around amino acids 82 and 97, respectively.

Methods

We generated anti-PrP monoclonal antibodies to epitopes immediately preceding the differential proteinase K cleavage sites. These antibodies, which were designated POM2 and POM12, recognise type 1, but not type 2, PrPSc.

Findings

We studied 114 brain samples from 70 patients with sporadic CJD and three patients with variant CJD. Every patient classified as CJD type 2, and all variant CJD patients, showed POM2/POM12 reactivity in the cerebellum and other PrPSc-rich brain areas, with a typical PrPSc type 1 migration pattern.

Interpretation

The regular coexistence of multiple PrPSc types in patients with CJD casts doubts on the validity of electrophoretic PrPSc mobilities as surrogates for prion strains, and questions the rational basis of current CJD classifications.

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The above results set the existing CJD classifications into debate and introduce interesting questions about human CJD types. For example, do human prion types exist in a dynamic equilibrium in the brains of affected individuals? Do they coexist in most or even all CJD cases? Is the biochemically identified PrPSc type simply the dominant type, and not the only PrPSc species?

Published online October 31, 2005

http://neurology.thelancet.com/


Detection of Type 1 Prion Protein in Variant Creutzfeldt-Jakob Disease

Helen M. Yull,* Diane L. Ritchie,* Jan P.M. Langeveld,? Fred G. van Zijderveld,? Moira E. Bruce,? James W. Ironside,* and Mark W. Head*

From the National CJD Surveillance Unit,* School of Molecular and Clinical Medicine, University of Edinburgh, Edinburgh, United Kingdom; Central Institute for Animal Disease Control (CIDC)-Lelystad, ? Lelystad, The Netherlands; Institute for Animal Health, Neuropathogenesis Unit, ? Edinburgh, United Kingdom

Molecular typing of the abnormal form of the prion protein (PrPSc) has come to be regarded as a powerful tool in the investigation of the prion diseases. All evidence thus far presented indicates a single PrPSc molecular type in variant Creutzfeldt-Jakob disease (termed type 2B), presumably resulting from infection with a single strain of the agent (bovine spongiform encephalopathy).

Here we show for the first time that the PrPSc that accumulates in the brain in variant Creutzfeldt- Jakob disease also contains a minority type 1 component. This minority type 1 PrPSc was found in all 21 cases of variant Creutzfeldt-Jakob disease tested, irrespective of brain region examined, and was also present in the variant Creutzfeldt-Jakob disease tonsil. The quantitative balance between PrPSc types was maintained when variant Creutzfeldt-Jakob disease was transmitted to wild-type mice and was also found in bovine spongiform encephalopathy cattle brain, indicating that the agent rather than the host specifies their relative representation. These results indicate that PrPSc molecular typing is based on quantitative rather than qualitative phenomena and point to a complex relationship between prion protein biochemistry, disease phenotype and agent strain. (Am J Pathol 2006, 168:151-157; DOI: 10.2353/ajpath.2006.050766)

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Discussion

Irrespective of whether this proves to be the case, the results shown here point to further complexities in the relationship between the physico-chemical properties of the prion protein, human disease phenotype, and prion agent strain.

Acknowledgments

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Type 1 PrPSc in Variant Creutzfeldt-Jakob Disease 157 AJP January 2006, Vol. 168, No. 1 ...TSS

http://ajp.amjpathol.org/


snip...see full text ;

Elsevier Editorial System(tm) for The Lancet Infectious Diseases Manuscript Draft Manuscript Number: Title: HUMAN and ANIMAL TSE Classifications i.e. mad cow disease and the UKBSEnvCJD only theory Article Type: Personal View Corresponding Author: Mr. Terry S. Singeltary, Corresponding Author's Institution: na First Author: Terry S Singeltary, none Order of Authors: Terry S Singeltary, none; Terry S. Singeltary


http://www.regulations.gov/search/Regs/contentStreamer?objectId=090000648027c28e&disposition=attachment&contentType=pdf



Thursday, November 05, 2009

Incidence and spectrum of sporadic Creutzfeldt-Jakob disease variants with mixed phenotype and co-occurrence of PrPSc types: an updated classification


http://creutzfeldt-jakob-disease.blogspot.com/2009/11/incidence-and-spectrum-of-sporadic.html



ALSO, SEE Scrapie Mission, Texas, did not produce _typical_ BSE....

3.57 The experiment which might have determined whether BSE and scrapie were caused by the same agent (ie, the feeding of natural scrapie to cattle) was never undertaken in the UK. It was, however, performed in the USA in 1979, when it was shown that cattle inoculated with the scrapie agent endemic in the flock of Suffolk sheep at the United States Department of Agriculture in Mission, Texas, developed a TSE quite unlike BSE.339 The findings of the initial transmission, though not of the clinical or neurohistological examination, were communicated in October 1988 to Dr Watson, Director of the CVL, following a visit by Dr Wrathall, one of the project leaders in the Pathology Department of the CVL, to the United States Department of Agriculture.340 The results were not published at this point, since the attempted transmission to mice from the experimental cow brain had been inconclusive. The results of the clinical and histological differences between scrapie-affected sheep and cattle were published in 1995. Similar studies in which cattle were inoculated intracerebrally with scrapie inocula derived from a number of scrapie-affected sheep of different breeds and from different States, were carried out at the US National Animal Disease Centre.341 The results, published in 1994, showed that this source of scrapie agent, though pathogenic for cattle,

*** did not produce the same clinical signs of brain lesions characteristic of BSE. ***

3.58 There are several possible reasons why the experiment was not performed in the UK. It had been recommended by Sir Richard Southwood (Chairman of the Working Party on Bovine Spongiform Encephalopathy) in his letter to the Permanent Secretary of MAFF, Mr (now Sir) Derek Andrews, on 21 June 1988,342 though it was not specifically recommended in the Working Party Report or indeed in the Tyrrell Committee Report (details of the Southwood Working Party and the Tyrell Committee can be found in vol. 4: The Southwood Working Party, 1988–89 and vol. 11: Scientists after Southwood respectively). The direct inoculation of scrapie into calves was given low priority, because of its high cost and because it was known that it had already taken place in the USA.343 It was also felt that the results of such an experiment would be hard to interpret. While a negative result 337 Fraser, H., Bruce, M., Chree, A., McConnell, I. and Wells, G. (1992) Transmission of Bovine Spongiform Encephalopathy and Scrapie to Mice, Journal of General Virology, 73, 1891–7; Bruce, M., Chree, A., McConnell, I., Foster, J., Pearson, G. and Fraser, H. (1994) Transmission of Bovine Spongiform Encephalopathy and Scrapie to Mice: Strain Variation and the Species Barrier, Philosophical Transactions of the Royal Society of London, Series B, Biological Sciences, 343, 405–11 338 Bruce, M., Will, R., Ironside, J., McConell, I., Drummond, D., Suttie, A., McCordie, L., Chree, A., Hope, J., Birkett, C., Cousens, S., Fraser, H. and Bostock, C. (1997) Transmissions to Mice Indicate that ‘New Variant’ CJD is Caused by the BSE Agent, Nature, 389, 498–501 339 Clark, W., Hourrigan, J. and Hadlow, W. (1995) Encephalopathy in Cattle Experimentally Infected with the Scrapie Agent, American Journal of Veterinary Research, 56, 606–12 340 YB88/10.00/1.1 341 Cutlip, R., Miller, J., Race, R., Jenny, A., Katz, J., Lehmkuhl, H., Debey, B. and Robinson, M. (1994) Intracerebral Transmission of Scrapie to Cattle, Journal of Infectious Diseases, 169, 814–20 342 YB88/6.21/1.2 343 YB88/11.17/2.4 SCIENCE 84 would be informative, a positive result would need to demonstrate that when scrapie was transmitted to cattle, the disease which developed in cattle was the same as BSE.344 Given the large number of strains of scrapie and the possibility that BSE was one of them, it would be necessary to transmit every scrapie strain to cattle separately, to test the hypothesis properly. Such an experiment would be expensive. Secondly, as measures to control the epidemic took hold, the need for the experiment from the policy viewpoint was not considered so urgent. It was felt that the results would be mainly of academic interest.345 3.59 Nevertheless, from the first demonstration of transmissibility of BSE in 1988, the possibility of differences in the transmission properties of BSE and scrapie was clear. Scrapie was transmissible to hamsters, but by 1988 attempts to transmit BSE to hamsters had failed. Subsequent findings increased that possibility.


http://www.bseinquiry.gov.uk/pdf/volume2/chapter3.pdf


http://bse-atypical.blogspot.com/2009/06/l-type-bse-h-type-bse-c-type-bse-ibnc.html


NOR-98 ATYPICAL SCRAPIE 5 cases documented in USA in 5 different states USA 2007

http://nor-98.blogspot.com/2008/04/seac-spongiform-encephalopathy-advisory.html

Tuesday, June 3, 2008 SCRAPIE USA UPDATE JUNE 2008 NOR-98 REPORTED PA


http://nor-98.blogspot.com/2008/06/scrapie-usa-update-june-2008-nor-98.html


http://nor-98.blogspot.com/



Monday, September 1, 2008

RE-FOIA OF DECLARATION OF EXTRAORDINARY EMERGENCY BECAUSE OF AN ATYPICAL T.S.E. (PRION DISEASE) OF FOREIGN ORIGIN IN THE UNITED STATES [No. 00-072-1] September 1, 2008


http://foiamadsheepmadrivervalley.blogspot.com/2008/09/re-foia-of-declaration-of-extraordinary.html



experimental transmission of 171RR Nor98 brain to 5 RR recipients (Jan 2008)


http://www.sheepusa.org/index.phtml?page=site/get_file&print=1&file_id=f4d1b2a4739ab82d903cf042526bd9ee



http://www.eradicatescrapie.org/Educational%20Resources/PDFs%20&%20PPTs/Genotyping%20PPT/Slide%20Notes%20for%20Genotyping.pdf



http://www.eradicatescrapie.org/Educational%20Resources/PDFs%20&%20PPTs/Genotyping%20PPT/Genotyping%20A%20Tool%20for%20Controlling%20Classical%20Scrapie.ppt



P7.12 Co-existence of classical and atypical scrapie strains in a sheep from an Italian outbreak

Results: IHC revealed the simultaneous presence in the brain of pathological features characteristic of Nor98 and classical scrapie. This was confirmed by WB: PrPres fragments characteristic of Nor98 and scrapie were simultaneously present in all areas investigated, although in different proportions, with Nor98 being more abundant in the cortex and classical scrapie in the brainstem. The lymph node showed the presence of PrPsc with a molecular pattern referable only to classical scrapie, while the tongue resulted negative. Genetic analysis showed the following genotype: A136L141R154Q171/A136F141R154Q171.

Discussion: Our results suggest either the co-existence of Nor98 and classical scrapie in this sheep or the presence of a new scrapie phenotype. The presence of classical scrapie in the outbreak and the genotype of the animal support the first event, which might be explained by the different genetic and cellular targets of the two strains. The bioassay analysis in bank voles and Tg338 mice, at the moment in progress, will help to confirm this hypothesis.

also see ;

P9.18 First Report of Classical Scrapie in Portugal, including co-existence with atypical scrapie in the same flock

also see ;

P9.37 Sporadic Creutzfeldt-Jakob Disease in the Basque Country: Coexistence of prion protein strains in the same and different brain regions

Discussion: The Basque Country presents one of the highest annual incidences of confirmed sCJD in Spain and in Europe (1.87 per million inhabitants per annum). It also suffers the highest frequency of FFI (43.12%). Regarding regional pattern distribution, our results show a predominance of PrPsc type 1 in sCJD. Surprisingly, a high frequency of cases with both types of prion protein was observed, indicating that the coexistence of two different molecular patterns in the same individual is more common than expected.



http://www.neuroprion.org/resources/pdf_docs/conferences/prion2008/abstract-book-prion2008.pdf



Saturday, May 2, 2009

APHIS AND WHO PLAN TO EXEMPT THE ATYPICAL SCRAPIE NOR-98 FROM REGULATIONS AT MEETING THIS MONTH


http://nor-98.blogspot.com/2009/05/aphis-and-who-plan-to-exempt-atypical.html



SCRAPIE DETECTED IN ANOTHER GOAT USA UPDATE MARCH 2009


http://scrapie-usa.blogspot.com/2009/04/scrapie-detected-in-another-goat-usa.html



Full Scientific Reports

Experimental oral transmission of United States origin scrapie to neonatal sheep

Amir N. Hamir1, Robert A. Kunkle, Justin J. Greenlee and Juergen A. Richt Correspondence: 1Corresponding Author: Amir N. Hamir, National Animal Disease Center, ARS, USDA, 2300 Dayton Avenue, PO Box 70, Ames, IA 50010. amir.hamir@ars.usda.gov

Scrapie, a transmissible spongiform encephalopathy (TSE), is a naturally occurring fatal neurodegenerative disease of sheep and goats. The current study documents incubation periods, pathologic findings, and distribution of abnormal prion proteins (PrPSc) by immunohistochemistry and Western blot in tissues of genetically susceptible and resistant neonatal lambs inoculated with pooled brain homogenates from 13 U.S. origin scrapie-affected ewes. Nine Suffolk lambs with genotypes AA/RR/QQ (n = 5) and AA/RR/QR (n = 4) at codons 136, 154, and 171, respectively) were orally inoculated, within 12 hr of birth, with 1 ml of a 10% (w/v) brain homogenate prepared from scrapie-affected sheep brains. Inoculated animals were euthanized when advanced clinical signs of scrapie were observed. All QQ sheep developed clinical signs of scrapie, with a mean survival time of 24 months. Spongiform lesions in the brains and PrPSc deposits in the central nervous system and lymphoid tissues were present in these sheep. None of the QR sheep succumbed to the disease. A previous study that used a larger volume (30 ml of 10% brain suspension) of the same inoculum in 4-month-old Suffolk lambs of susceptible genotype documented longer survival periods (average 32 months), and only 5 of 9 inoculated sheep developed scrapie. Findings of this study suggest that orally exposed neonatal lambs of a susceptible (QQ) genotype exhibit a higher attack rate and shorter incubation period than older (4-month-old) lambs exposed to a larger dose (30x) of the same inoculum.

Key Words: Immunohistochemistry . neonatal sheep . scrapie . spongiform encephalopathy . Western blot

http://jvdi.org/cgi/content/abstract/21/1/64?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=prion&searchid=1&FIRSTINDEX=0&volume=21&issue=1&resourcetype=HWCIT



EVIDENCE OF SCRAPIE IN SHEEP AS A RESULT OF FOOD BORNE EXPOSURE

This is provided by the statistically significant increase in the incidence of sheep scrape from 1985, as determined from analyses of the submissions made to VI Centres, and from individual case and flock incident studies. ........

http://web.archive.org/web/20010305222246/www.bseinquiry.gov.uk/files/yb/1994/02/07002001.pdf


Title: Characterization of a U.S. Sheep Scrapie Isolate with Short Incubation Time

Authors

Hamir, Amirali Richt, Juergen Kunkle, Robert Greenlee, Justin Bulgin, M - UNIVERSITY OF IDAHO Gregori, L - VA MEDICAL CENTER, MD Rohwer, R - VA MEDICAL CENTER, MD

Submitted to: Veterinary Pathology Publication Type: Peer Reviewed Journal Publication Acceptance Date: April 16, 2009 Publication Date: N/A

Interpretive Summary: Scrapie is a naturally occurring fatal disease of sheep and goats. In a previous study it was shown that sheep inoculated with US scrapie inoculum (No. 13-7) induced terminal disease within an average of 19 months. We have since produced an inoculum, No. X124 from pooled brains of US origin sheep scrapie, that results in incubations nearly 3 fold shorter. The present study documents laboratory findings in tissues of sheep inoculated with No. X124. All inoculated sheep developed clinical disease and were euthanized within an average of 7.7 months post inoculation (MPI). Sheep that were genetically susceptible developed the disease faster (within 6 months). Also, the inoculum was able to induce disease in a short time (7 MPI) in a sheep that was supposed to be highly resistant to scrapie. This indicates that inoculum No. X124 appears to be more virulent than inoculum No. 13-7. Importantly this strain of scrapie represents a significant development in that it provides a natural model that requires less than 25 percent of the time for the disease to develop, thus enabling a faster pace for research investigating prion disease pathogenesis and inactivation. Technical Abstract: Scrapie is a naturally occurring fatal neurodegenerative disease of sheep and goats. Susceptibility to the disease is partly dependent upon the genetic makeup of the host. In a previous study it was shown that sheep intracerebrally inoculated with US scrapie inoculum (No. 13-7) developed terminal disease within an average of 19 months. We have since produced an inoculum, No. x124 from pooled brains of US origin sheep scrapie, that results in incubations nearly 3 fold shorter. The present study documents clinicopathological findings and the distribution of abnormal prion proteins (PrP**Sc) by immunohistochemical (IHC) and Western blot (WB) techniques, in tissues of sheep inoculated with No. x124. All inoculated sheep developed clinical disease and were euthanized within an average of 7.7 months post-inoculation (MPI). Sheep that had VV or AV at codon 136 of prion protein (PRNP) gene developed the disease faster and were euthanized at an average of 4.3 and 5.6 MPI, respectively. Also, the inoculum was able to induce disease in a short time (7 MPI) in a sheep that was relatively resistant (QR at codon 171) to scrapie. This indicates that inoculum No. x124 appears to induce scrapie in shorter time than inoculum No. 13-7, especially in sheep homozygous or heterozygous for valine at codon 136.

http://www.ars.usda.gov/research/publications/publications.htm?seq_no_115=230885



1: J Infect Dis 1980 Aug;142(2):205-8

Oral transmission of kuru, Creutzfeldt-Jakob disease, and scrapie to nonhuman primates.

Gibbs CJ Jr, Amyx HL, Bacote A, Masters CL, Gajdusek DC.

Kuru and Creutzfeldt-Jakob disease of humans and scrapie disease of sheep and goats were transmitted to squirrel monkeys (Saimiri sciureus) that were exposed to the infectious agents only by their nonforced consumption of known infectious tissues. The asymptomatic incubation period in the one monkey exposed to the virus of kuru was 36 months; that in the two monkeys exposed to the virus of Creutzfeldt-Jakob disease was 23 and 27 months, respectively; and that in the two monkeys exposed to the virus of scrapie was 25 and 32 months, respectively. Careful physical examination of the buccal cavities of all of the monkeys failed to reveal signs or oral lesions. One additional monkey similarly exposed to kuru has remained asymptomatic during the 39 months that it has been under observation.

PMID: 6997404

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=6997404&dopt=Abstract



12/10/76 AGRICULTURAL RESEARCH COUNCIL REPORT OF THE ADVISORY COMMITTE ON SCRAPIE Office Note CHAIRMAN: PROFESSOR PETER WILDY

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A The Present Position with respect to Scrapie

A1 The Problem

Scrapie is a natural disease of sheep and goats. It is a slow and inexorably progressive degenerative disorder of the nervous system and it ia fatal. It is enzootic in the United Kingdom but not in all countries.

The field problem has been reviewed by a MAFF working group (ARC 35/77). It is difficult to assess the incidence in Britain for a variety of reasons but the disease causes serious financial loss; it is estimated that it cost Swaledale breeders alone $l.7 M during the five years 1971-1975. A further inestimable loss arises from the closure of certain export markets, in particular those of the United States, to British sheep.

It is clear that scrapie in sheep is important commercially and for that reason alone effective measures to control it should be devised as quickly as possible.

Recently the question has again been brought up as to whether scrapie is transmissible to man. This has followed reports that the disease has been transmitted to primates. One particularly lurid speculation (Gajdusek 1977) conjectures that the agents of scrapie, kuru, Creutzfeldt-Jakob disease and transmissible encephalopathy of mink are varieties of a single "virus". The U.S. Department of Agriculture concluded that it could "no longer justify or permit scrapie-blood line and scrapie-exposed sheep and goats to be processed for human or animal food at slaughter or rendering plants" (ARC 84/77)" The problem is emphasised by the finding that some strains of scrapie produce lesions identical to the once which characterise the human dementias"

Whether true or not. the hypothesis that these agents might be transmissible to man raises two considerations. First, the safety of laboratory personnel requires prompt attention. Second, action such as the "scorched meat" policy of USDA makes the solution of the acrapie problem urgent if the sheep industry is not to suffer grievously.

snip...

76/10.12/4.6

http://web.archive.org/web/20010305223125/www.bseinquiry.gov.uk/files/yb/1976/10/12004001.pdf



Epidemiology of Scrapie in the United States 1977

http://www.bseinquiry.gov.uk/files/mb/m08b/tab64.pdf



http://scrapie-usa.blogspot.com/



Like lambs to the slaughter 31 March 2001 by Debora MacKenzie Magazine issue 2284

FOUR years ago, Terry Singeltary watched his mother die horribly from a degenerative brain disease. Doctors told him it was Alzheimer's, but Singeltary was suspicious. The diagnosis didn't fit her violent symptoms, and he demanded an autopsy. It showed she had died of sporadic Creutzfeldt-Jakob disease.

Most doctors believe that sCJD is caused by a prion protein deforming by chance into a killer. But Singeltary thinks otherwise. He is one of a number of campaigners who say that some sCJD, like the variant CJD related to BSE, is caused by eating meat from infected animals. Their suspicions have focused on sheep carrying scrapie, a BSE-like disease that is widespread in flocks across Europe and North America.

Now scientists in France have stumbled across new evidence that adds weight to the campaigners' fears. To their complete surprise, the researchers found that one strain of scrapie causes the same brain damage in ...

http://www.newscientist.com/article/mg16922840.300-like-lambs-to-the-slaughter.html



http://nor-98.blogspot.com/



http://scrapie-usa.blogspot.com/



Wednesday, July 1, 2009

Nor98 scrapie identified in the United States J Vet Diagn Invest 21:454-463 (2009)

http://nor-98.blogspot.com/2009/07/nor98-scrapie-identified-in-united.html





Thursday, November 12, 2009

BSE FEED RECALL Misbranding of product by partial label removal to hide original source of materials 2009


http://madcowfeed.blogspot.com/2009/11/bse-feed-recall-misbranding-of-product.html





Tuesday, November 10, 2009

Surveillance On the Bovine Spongiform Encephalopathy and rabies in Taiwan


http://usdavskorea.blogspot.com/2009/11/surveillance-on-bovine-spongiform.html






Terry S. Singeltary Sr.

P.O. Box 42

Bacliff, Texas USA 77518

Labels: , , , ,

Thursday, October 15, 2009

SCRAPIE UPDATE CANADA 2009 (typical and atypical cases)

Flocks infected with scrapie in Canada in 2009 The CFIA, in co-operation with provincial governments and industry, launched a national scrapie surveillance program in 2005. Under the program, producers are encouraged to report animals that die on the farm or exhibit symptoms of the disease.

In addition, scrapie is a reportable disease under the Health of Animals Regulations. This means that all suspected cases must be reported to the CFIA.

The following table lists sheep flocks and/or goat herds confirmed to be infected with scrapie in Canada in 2009.

Updated: 2009-09-30

Date confirmed Location Animal type infected

April 29 Quebec Sheep

May 21* Saskatchewan Sheep

June 12 Quebec Sheep

July 23* Alberta Sheep

September 14* Ontario Sheep


*Atypical scrapie



http://www.inspection.gc.ca/english/anima/disemala/rep/2009scrtree.shtml





Wednesday, July 1, 2009

Nor98 scrapie identified in the United States J Vet Diagn Invest 21:454-463 (2009)


http://nor-98.blogspot.com/2009/07/nor98-scrapie-identified-in-united.html



Thursday, October 15, 2009

Transmissibility studies of vacuolar changes in the rostral colliculus of pigs

Research article Open Access




http://madporcinedisease.blogspot.com/2009/10/transmissibility-studies-of-vacuolar.html








TSS

Labels: , , , , , ,

Monday, August 03, 2009

Prions Are Secreted in Milk from Clinically Normal Scrapie-Exposed Sheep

Journal of Virology, August 2009, p. 8293-8296, Vol. 83, No. 16 0022-538X/09/$08.00+0 doi:10.1128/JVI.00051-09 Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Prions Are Secreted in Milk from Clinically Normal Scrapie-Exposed Sheep

B. C. Maddison,1 C. A. Baker,1 H. C. Rees,2 L. A. Terry,3 L. Thorne,3 S. J. Bellworthy,3 G. C. Whitelam,2 and K. C. Gough4* ADAS UK, Department of Biology, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom,1 Department of Biology, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom,2 Veterinary Laboratories Agency, Woodham Lane, New Haw, Addlestone, Surrey KT15 3NB, United Kingdom,3 School of Veterinary Medicine and Science, The University of Nottingham, Sutton Bonington Campus, College Road, Sutton Bonington, Leicestershire LE12 5RD, United Kingdom4

Received 9 January 2009/ Accepted 27 May 2009

The potential spread of prion infectivity in secreta is a crucial concern for prion disease transmission. Here, serial protein misfolding cyclic amplification (sPMCA) allowed the detection of prions in milk from clinically affected animals as well as scrapie-exposed sheep at least 20 months before clinical onset of disease, irrespective of the immunohistochemical detection of protease-resistant PrPSc within lymphoreticular and central nervous system tissues. These data indicate the secretion of prions within milk during the early stages of disease progression and a role for milk in prion transmission. Furthermore, the application of sPMCA to milk samples offers a noninvasive methodology to detect scrapie during preclinical/subclinical disease.

--------------------------------------------------------------------------------

* Corresponding author. Mailing address: School of Veterinary Medicine and Science, The University of Nottingham, Sutton Bonington Campus, College Road, Sutton Bonington, Leicestershire LE12 5RD, United Kingdom. Phone: 44-115-9516272. Fax: 44-115-9516440. E-mail: kevin.gough@nottingham.ac.uk

Published ahead of print on 3 June 2009.

--------------------------------------------------------------------------------

Journal of Virology, August 2009, p. 8293-8296, Vol. 83, No. 16 0022-538X/09/$08.00+0 doi:10.1128/JVI.00051-09 Copyright © 2009, American Society for Microbiology. All Rights Reserved.





http://jvi.asm.org/cgi/content/abstract/83/16/8293





TAFS INTERNATIONAL FORUM FOR TRANSMISSIBLE ANIMAL DISEASES AND FOOD SAFETY a non-profit Swiss Foundation (January, 2009) TAFS1 STATEMENT ON TRANSMISSION OF SCRAPIE VIA MILK





http://www.tafsforum.org/position_papers/TAFS_POSITION_PAPER_TRANSMISSION_SCRAPIE_MILK_2009.pdf





Friday, December 12, 2008 Prions in Milk from Ewes Incubating Natural Scrapie





http://scrapie-usa.blogspot.com/2008/12/prions-in-milk-from-ewes-incubating.html





Sheep consumption: a possible source of spongiform encephalopathy in humans.

Davanipour Z, Alter M, ***el E, Callahan M.

A fatal spongiform encephalopathy of sheep and goats (scrapie) shares many characteristics with Creutzfeldt-Jakob disease (CJD), a similar dementing illness of humans. To investigate the possibility that CJD is acquired by ingestion of contaminated sheep products, we collected information on production, slaughtering practices, and marketing of sheep in Pennsylvania. The study revealed that sheep were usually marketed before central nervous system signs of scrapie are expected to appear; breeds known to be susceptible to the disease were the most common breeds raised in the area; sheep were imported from other states including those with a high frequency of scrapie; use of veterinary services on the sheep farms investigated and, hence, opportunities to detect the disease were limited; sheep producers in the area knew little about scrapie despite the fact that the disease has been reported in the area, and animal organs including sheep organs were sometimes included in processed food. Therefore, it was concluded that in Pennsylvania there are some 'weak links' through which scrapie-infected animals could contaminate human food, and that consumption of these foods could perhaps account for spongiform encephalopathy in humans. The weak links observed are probably not unique to Pennsylvania.





http://www.ncbi.nlm.nih.gov:80/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=3915057&dopt=Abstract





Oral transmission of kuru, Creutzfeldt-Jakob disease, and scrapie to nonhuman primates.

Gibbs CJ Jr, Amyx HL, Bacote A, Masters CL, Gajdusek DC.

Kuru and Creutzfeldt-Jakob disease of humans and scrapie disease of sheep and goats were transmitted to squirrel monkeys (Saimiri sciureus) that were exposed to the infectious agents only by their nonforced consumption of known infectious tissues. The asymptomatic incubation period in the one monkey exposed to the virus of kuru was 36 months; that in the two monkeys exposed to the virus of Creutzfeldt-Jakob disease was 23 and 27 months, respectively; and that in the two monkeys exposed to the virus of scrapie was 25 and 32 months, respectively. Careful physical examination of the buccal cavities of all of the monkeys failed to reveal signs or oral lesions. One additional monkey similarly exposed to kuru has remained asymptomatic during the 39 months that it has been under observation.

PMID: 6997404





http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=6997404&dopt=Abstract





Full Scientific Reports

Experimental oral transmission of United States origin scrapie to neonatal sheep

Amir N. Hamir1, Robert A. Kunkle, Justin J. Greenlee and Juergen A. Richt Correspondence: 1Corresponding Author: Amir N. Hamir, National Animal Disease Center, ARS, USDA, 2300 Dayton Avenue, PO Box 70, Ames, IA 50010. amir.hamir@ars.usda.gov

Scrapie, a transmissible spongiform encephalopathy (TSE), is a naturally occurring fatal neurodegenerative disease of sheep and goats. The current study documents incubation periods, pathologic findings, and distribution of abnormal prion proteins (PrPSc) by immunohistochemistry and Western blot in tissues of genetically susceptible and resistant neonatal lambs inoculated with pooled brain homogenates from 13 U.S. origin scrapie-affected ewes. Nine Suffolk lambs with genotypes AA/RR/QQ (n = 5) and AA/RR/QR (n = 4) at codons 136, 154, and 171, respectively) were orally inoculated, within 12 hr of birth, with 1 ml of a 10% (w/v) brain homogenate prepared from scrapie-affected sheep brains. Inoculated animals were euthanized when advanced clinical signs of scrapie were observed. All QQ sheep developed clinical signs of scrapie, with a mean survival time of 24 months. Spongiform lesions in the brains and PrPSc deposits in the central nervous system and lymphoid tissues were present in these sheep. None of the QR sheep succumbed to the disease. A previous study that used a larger volume (30 ml of 10% brain suspension) of the same inoculum in 4-month-old Suffolk lambs of susceptible genotype documented longer survival periods (average 32 months), and only 5 of 9 inoculated sheep developed scrapie. Findings of this study suggest that orally exposed neonatal lambs of a susceptible (QQ) genotype exhibit a higher attack rate and shorter incubation period than older (4-month-old) lambs exposed to a larger dose (30x) of the same inoculum.

Key Words: Immunohistochemistry . neonatal sheep . scrapie . spongiform encephalopathy . Western blot





http://jvdi.org/cgi/content/abstract/21/1/64?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=prion&searchid=1&FIRSTINDEX=0&volume=21&issue=1&resourcetype=HWCIT





EVIDENCE OF SCRAPIE IN SHEEP AS A RESULT OF FOOD BORNE EXPOSURE

This is provided by the statistically significant increase in the incidence of sheep scrape from 1985, as determined from analyses of the submissions made to VI Centres, and from individual case and flock incident studies. ........





http://www.bseinquiry.gov.uk/files/yb/1994/02/07002001.pdf





Title: Characterization of a U.S. Sheep Scrapie Isolate with Short Incubation Time

Authors

Hamir, Amirali Richt, Juergen Kunkle, Robert Greenlee, Justin Bulgin, M - UNIVERSITY OF IDAHO Gregori, L - VA MEDICAL CENTER, MD Rohwer, R - VA MEDICAL CENTER, MD

Submitted to: Veterinary Pathology Publication Type: Peer Reviewed Journal Publication Acceptance Date: April 16, 2009 Publication Date: N/A

Interpretive Summary: Scrapie is a naturally occurring fatal disease of sheep and goats. In a previous study it was shown that sheep inoculated with US scrapie inoculum (No. 13-7) induced terminal disease within an average of 19 months. We have since produced an inoculum, No. X124 from pooled brains of US origin sheep scrapie, that results in incubations nearly 3 fold shorter. The present study documents laboratory findings in tissues of sheep inoculated with No. X124. All inoculated sheep developed clinical disease and were euthanized within an average of 7.7 months post inoculation (MPI). Sheep that were genetically susceptible developed the disease faster (within 6 months). Also, the inoculum was able to induce disease in a short time (7 MPI) in a sheep that was supposed to be highly resistant to scrapie. This indicates that inoculum No. X124 appears to be more virulent than inoculum No. 13-7. Importantly this strain of scrapie represents a significant development in that it provides a natural model that requires less than 25 percent of the time for the disease to develop, thus enabling a faster pace for research investigating prion disease pathogenesis and inactivation. Technical Abstract: Scrapie is a naturally occurring fatal neurodegenerative disease of sheep and goats. Susceptibility to the disease is partly dependent upon the genetic makeup of the host. In a previous study it was shown that sheep intracerebrally inoculated with US scrapie inoculum (No. 13-7) developed terminal disease within an average of 19 months. We have since produced an inoculum, No. x124 from pooled brains of US origin sheep scrapie, that results in incubations nearly 3 fold shorter. The present study documents clinicopathological findings and the distribution of abnormal prion proteins (PrP**Sc) by immunohistochemical (IHC) and Western blot (WB) techniques, in tissues of sheep inoculated with No. x124. All inoculated sheep developed clinical disease and were euthanized within an average of 7.7 months post-inoculation (MPI). Sheep that had VV or AV at codon 136 of prion protein (PRNP) gene developed the disease faster and were euthanized at an average of 4.3 and 5.6 MPI, respectively. Also, the inoculum was able to induce disease in a short time (7 MPI) in a sheep that was relatively resistant (QR at codon 171) to scrapie. This indicates that inoculum No. x124 appears to induce scrapie in shorter time than inoculum No. 13-7, especially in sheep homozygous or heterozygous for valine at codon 136.





http://www.ars.usda.gov/research/publications/publications.htm?seq_no_115=230885





12/10/76 AGRICULTURAL RESEARCH COUNCIL REPORT OF THE ADVISORY COMMITTE ON SCRAPIE Office Note CHAIRMAN: PROFESSOR PETER WILDY

snip...

A The Present Position with respect to Scrapie

A1 The Problem

Scrapie is a natural disease of sheep and goats. It is a slow and inexorably progressive degenerative disorder of the nervous system and it ia fatal. It is enzootic in the United Kingdom but not in all countries.

The field problem has been reviewed by a MAFF working group (ARC 35/77). It is difficult to assess the incidence in Britain for a variety of reasons but the disease causes serious financial loss; it is estimated that it cost Swaledale breeders alone $l.7 M during the five years 1971-1975. A further inestimable loss arises from the closure of certain export markets, in particular those of the United States, to British sheep.

It is clear that scrapie in sheep is important commercially and for that reason alone effective measures to control it should be devised as quickly as possible.

Recently the question has again been brought up as to whether scrapie is transmissible to man. This has followed reports that the disease has been transmitted to primates. One particularly lurid speculation (Gajdusek 1977) conjectures that the agents of scrapie, kuru, Creutzfeldt-Jakob disease and transmissible encephalopathy of mink are varieties of a single "virus". The U.S. Department of Agriculture concluded that it could "no longer justify or permit scrapie-blood line and scrapie-exposed sheep and goats to be processed for human or animal food at slaughter or rendering plants" (ARC 84/77)" The problem is emphasised by the finding that some strains of scrapie produce lesions identical to the once which characterise the human dementias"

Whether true or not. the hypothesis that these agents might be transmissible to man raises two considerations. First, the safety of laboratory personnel requires prompt attention. Second, action such as the "scorched meat" policy of USDA makes the solution of the acrapie problem urgent if the sheep industry is not to suffer grievously.

snip...

76/10.12/4.6





http://www.bseinquiry.gov.uk/files/yb/1976/10/12004001.pdf





Epidemiology of Scrapie in the United States 1977





http://www.bseinquiry.gov.uk/files/mb/m08b/tab64.pdf





http://scrapie-usa.blogspot.com/





Like lambs to the slaughter 31 March 2001 by Debora MacKenzie Magazine issue 2284

FOUR years ago, Terry Singeltary watched his mother die horribly from a degenerative brain disease. Doctors told him it was Alzheimer's, but Singeltary was suspicious. The diagnosis didn't fit her violent symptoms, and he demanded an autopsy. It showed she had died of sporadic Creutzfeldt-Jakob disease.

Most doctors believe that sCJD is caused by a prion protein deforming by chance into a killer. But Singeltary thinks otherwise. He is one of a number of campaigners who say that some sCJD, like the variant CJD related to BSE, is caused by eating meat from infected animals. Their suspicions have focused on sheep carrying scrapie, a BSE-like disease that is widespread in flocks across Europe and North America.

Now scientists in France have stumbled across new evidence that adds weight to the campaigners' fears. To their complete surprise, the researchers found that one strain of scrapie causes the same brain damage in ...





http://www.newscientist.com/article/mg16922840.300-like-lambs-to-the-slaughter.html







http://nor-98.blogspot.com/





http://scrapie-usa.blogspot.com/





Saturday, June 13, 2009

Monitoring the occurrence of emerging forms of Creutzfeldt-Jakob disease in the United States 2003 revisited 2009





http://cjdusa.blogspot.com/2009/06/monitoring-occurrence-of-emerging-forms.html





SEE THIS DAMNING VIDEO NOW AT THE BOTTOM OF THE BLOG BELOW ;





http://creutzfeldt-jakob-disease.blogspot.com/2009/07/usa-hiding-mad-cow-disease-victims-as.html





Terry S. Singeltary Sr. P.O. Box 42 Bacliff, Texas USA 77518

Labels: , , ,

Tuesday, July 21, 2009

Prions Are Secreted in Milk from Clinically Normal Scrapie-Exposed Sheep

Journal of Virology, August 2009, p. 8293-8296, Vol. 83, No. 16 0022-538X/09/$08.00+0 doi:10.1128/JVI.00051-09 Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Prions Are Secreted in Milk from Clinically Normal Scrapie-Exposed Sheep

B. C. Maddison,1 C. A. Baker,1 H. C. Rees,2 L. A. Terry,3 L. Thorne,3 S. J. Bellworthy,3 G. C. Whitelam,2 and K. C. Gough4* ADAS UK, Department of Biology, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom,1 Department of Biology, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom,2 Veterinary Laboratories Agency, Woodham Lane, New Haw, Addlestone, Surrey KT15 3NB, United Kingdom,3 School of Veterinary Medicine and Science, The University of Nottingham, Sutton Bonington Campus, College Road, Sutton Bonington, Leicestershire LE12 5RD, United Kingdom4

Received 9 January 2009/ Accepted 27 May 2009

The potential spread of prion infectivity in secreta is a crucial concern for prion disease transmission. Here, serial protein misfolding cyclic amplification (sPMCA) allowed the detection of prions in milk from clinically affected animals as well as scrapie-exposed sheep at least 20 months before clinical onset of disease, irrespective of the immunohistochemical detection of protease-resistant PrPSc within lymphoreticular and central nervous system tissues. These data indicate the secretion of prions within milk during the early stages of disease progression and a role for milk in prion transmission. Furthermore, the application of sPMCA to milk samples offers a noninvasive methodology to detect scrapie during preclinical/subclinical disease.

-------------------------------------------------------------------------------- *

Corresponding author. Mailing address: School of Veterinary Medicine and Science, The University of Nottingham, Sutton Bonington Campus, College Road, Sutton Bonington, Leicestershire LE12 5RD, United Kingdom. Phone: 44-115-9516272. Fax: 44-115-9516440. E-mail:
kevin.gough@nottingham.ac.uk

Published ahead of print on 3 June 2009.

--------------------------------------------------------------------------------

Journal of Virology, August 2009, p. 8293-8296, Vol. 83, No. 16 0022-538X/09/$08.00+0 doi:10.1128/JVI.00051-09 Copyright © 2009, American Society for Microbiology. All Rights Reserved.





http://jvi.asm.org/cgi/content/abstract/83/16/8293?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=PRION&searchid=1&FIRSTINDEX=0&volume=83&issue=16&resourcetype=HWCIT





Wednesday, March 18, 2009 Detection of CWD Prions in Urine and Saliva of Deer by Transgenic Mouse Bioassay





http://chronic-wasting-disease.blogspot.com/2009/03/detection-of-cwd-prions-in-urine-and.html





Friday, December 12, 2008 Prions in Milk from Ewes Incubating Natural Scrapie

Prions in Milk from Ewes Incubating Natural Scrapie





http://scrapie-usa.blogspot.com/2008/12/prions-in-milk-from-ewes-incubating.html





****** [5] Italy: Prions suspected in sheep milk Date: Tue 8 Nov 2005 From: ProMED-mail <mhtml:%7B33B38F65-8D2E-434D-8F9B-8BDCD77D3066%7Dmid://00000473/!x-usc:mailto:promed@promedmail.org> Source: mhtml:%7B33B38F65-8D2E-434D-8F9B-8BDCD77D3066%7Dmid://00000473/!x-usc:mailto:News@nature.com, 3 Nov 2005 [edited]




<http://www.nature.com/news/2005/051031/full/051031-7.html>





http://www.promedmail.org/pls/otn/f?p=2400:1202:5548991170320905::NO::F2400_P1202_CHECK_DISPLAY,F2400_P1202_PUB_MAIL_ID:X,30998






TSS

Labels: , ,

Friday, May 29, 2009

Characterization of a U.S. Sheep Scrapie Isolate with Short Incubation Time

Title: Characterization of a U.S. Sheep Scrapie Isolate with Short Incubation Time

Authors

Hamir, Amirali Richt, Juergen Kunkle, Robert Greenlee, Justin Bulgin, M - UNIVERSITY OF IDAHO Gregori, L - VA MEDICAL CENTER, MD Rohwer, R - VA MEDICAL CENTER, MD

Submitted to: Veterinary Pathology Publication Type: Peer Reviewed Journal Publication Acceptance Date: April 16, 2009 Publication Date: N/A

Interpretive Summary: Scrapie is a naturally occurring fatal disease of sheep and goats. In a previous study it was shown that sheep inoculated with US scrapie inoculum (No. 13-7) induced terminal disease within an average of 19 months. We have since produced an inoculum, No. X124 from pooled brains of US origin sheep scrapie, that results in incubations nearly 3 fold shorter. The present study documents laboratory findings in tissues of sheep inoculated with No. X124. All inoculated sheep developed clinical disease and were euthanized within an average of 7.7 months post inoculation (MPI). Sheep that were genetically susceptible developed the disease faster (within 6 months). Also, the inoculum was able to induce disease in a short time (7 MPI) in a sheep that was supposed to be highly resistant to scrapie. This indicates that inoculum No. X124 appears to be more virulent than inoculum No. 13-7. Importantly this strain of scrapie represents a significant development in that it provides a natural model that requires less than 25 percent of the time for the disease to develop, thus enabling a faster pace for research investigating prion disease pathogenesis and inactivation. Technical Abstract: Scrapie is a naturally occurring fatal neurodegenerative disease of sheep and goats. Susceptibility to the disease is partly dependent upon the genetic makeup of the host. In a previous study it was shown that sheep intracerebrally inoculated with US scrapie inoculum (No. 13-7) developed terminal disease within an average of 19 months. We have since produced an inoculum, No. x124 from pooled brains of US origin sheep scrapie, that results in incubations nearly 3 fold shorter. The present study documents clinicopathological findings and the distribution of abnormal prion proteins (PrP**Sc) by immunohistochemical (IHC) and Western blot (WB) techniques, in tissues of sheep inoculated with No. x124. All inoculated sheep developed clinical disease and were euthanized within an average of 7.7 months post-inoculation (MPI). Sheep that had VV or AV at codon 136 of prion protein (PRNP) gene developed the disease faster and were euthanized at an average of 4.3 and 5.6 MPI, respectively. Also, the inoculum was able to induce disease in a short time (7 MPI) in a sheep that was relatively resistant (QR at codon 171) to scrapie. This indicates that inoculum No. x124 appears to induce scrapie in shorter time than inoculum No. 13-7, especially in sheep homozygous or heterozygous for valine at codon 136.



http://www.ars.usda.gov/research/publications/publications.htm?seq_no_115=230885




Towards that end, ARS Pullman geneticist Stephen White is leading a team of ARS and university scientists to characterize the prion protein gene of goats and identify important gene variants in individuals and breeds. The Pullman team has so far examined the prion protein gene sequences from 446 goats representing 10 breeds, 8 of which have never been genetically characterized for their potential scrapie response. The team’s analysis found four gene variants (R143, S146, H154, and K222) in the genes of Boer, Nubian, Saanen, Toggenburg, and a few other goat breeds. These gene variants were relatively rare or absent in animals that developed scrapie in previous outbreaks, which suggests these gene variants might help the animals in some way. A fifth variant (M142) was found mainly in Alpine and Toggenburg goats, and it is known to delay incubation of scrapie from infection to clinical disease. More work is needed to demonstrate true resistance for any of these genetic variations, notes the team in a paper published in the September-October 2008 issue of Genetic Selection Evolution.



http://www.ars.usda.gov/is/AR/archive/apr09/goats0409.pdf




To be published in the Proceedings of the Fourth International Scientific Congress in Fur Animal Production. Toronto, Canada, August 21-28, 1988

Evidence That Transmissible Mink Encephalopathy Results from Feeding Infected Cattle

R.F. Marsh* and G.R. Hartsough

•Department of Veterinary Science, University of Wisconsin-Madison, Madison, Wisconsin 53706; and ^Emba/Creat Lakes Ranch Service, Thiensville, Wisconsin 53092

ABSTRACT

Epidemiologic investigation of a new incidence of transmissible mink encephalopathy (TME) in Stetsonville, Wisconsin suggests that the disease may have resulted from feeding infected cattle to mink. This observation is supported by the transmission of a TME-like disease to experimentally inoculated cattle, and by the recent report of a new bovine spongiform encephalopathy in England.

snip...

OBSERVATIONS AND RESULTS

A New Incidence of TME. In April of 1985, a mink rancher in Stetsonville, Wisconsin reported that many of his mink were “acting funny”, and some had died. At this time, we visited the farm and found that approximately 10% of all adult mink were showing typical signs of TME: insidious onset characterized by subtle behavioral changes, loss of normal habits of cleanliness, deposition of droppings throughout the pen rather than in a single area, hyperexcitability, difficulty in chewing and swallowing, and tails arched over their _backs like squirrels. These signs were followed by progressive deterioration of neurologic function beginning with locomoior incoordination, long periods of somnolence in which the affected mink would stand motionless with its head in the corner of the cage, complete debilitation, and death.

Over the next 8-10 weeks, approximately 40% of all the adult mink on the farm died from TME. Since previous incidences of TME were associated with common or shared feeding practices, we obtained a careful history of feed ingredients used over the past 12-18 months. ***The rancher was a “dead stock” feeder using mostly (>95%) downer or dead dairy cattle and a few horses. Sheep had never been fed.***

snip...end



http://www.bseinquiry.gov.uk/files/mb/m09/tab05.pdf




Epidemiology Epidemiologic studies suggest that animals contract the disease by external exposure to the infectious agent, such as by eating contaminated feed. No evidence suggests that the TME agent spreads by contact between unrelated mink or from mother to nursing young. The disease has been identified in both genders and all color phases in animals greater than 1 year old. The first documented TME outbreak in the United States occurred in 1947 on one ranch in Wisconsin and then on a ranch in Minnesota that had received mink from the Wisconsin ranch. In 1961, TME outbreaks occurred on five ranches in Wisconsin. In Factsheet Veterinary Services February 2002 APHIS 1963, outbreaks occurred in Idaho, Minnesota, and Wisconsin. Epidemiologic data from the Minnesota and Wisconsin outbreaks trace the cases in those States to one common purchased food source.

snip...

The 1985 Stetsonville Outbreak The most recent TME outbreak occurred on one mink ranch in Stetsonville, WI, in 1985. In the herd of 7,300 adult mink, 60 percent of the animals died. Clinical signs included tail arching, incoordination, and hyperexcitability. At the most advanced stages of the disease, the animals were in trancelike states and eventually died. The outbreak lasted 5 months. Microscopic examination of sections of the brain confirmed the spongelike changes characteristic of TME. Diagnostic tests identified the prion protein. The following year, mink born during the outbreak showed no signs of TME. The late Richard Marsh, a veterinary virologist at the University of Wisconsin who studied the transmission of TME and other TSE’s, investigated this outbreak. Marsh learned that the mink were fed a diet composed of fresh meat products from “downer cattle” and commercial sources of fish, poultry, and cereal. Downer cattle are nonambulatory and cannot rise because they are affected with a condition such as a metabolic disease, broken limbs, or a central nervous system disorder. Marsh theorized that the meat from these downer cattle introduced a TSE agent to the mink in which TME resulted. Although Marsh’s hypothesis is based on speculation and anecdotal evidence, in 1993 APHIS adjusted its national BSE surveillance program to include testing downer cattle for evidence of a TSE. The brains of more than 20,141 cattle have been examined at APHIS’ National Veterinary Services Laboratories and other State diagnostic laboratories. Not a single tissue sample has revealed evidence of BSE or another TSE in cattle.



http://www.aphis.usda.gov/publications/animal_health/content/printable_version/fs_ahtme.pdf




1: J Infect Dis 1980 Aug;142(2):205-8

Oral transmission of kuru, Creutzfeldt-Jakob disease, and scrapie to nonhuman primates.

Gibbs CJ Jr, Amyx HL, Bacote A, Masters CL, Gajdusek DC.

Kuru and Creutzfeldt-Jakob disease of humans and scrapie disease of sheep and goats were transmitted to squirrel monkeys (Saimiri sciureus) that were exposed to the infectious agents only by their nonforced consumption of known infectious tissues. The asymptomatic incubation period in the one monkey exposed to the virus of kuru was 36 months; that in the two monkeys exposed to the virus of Creutzfeldt-Jakob disease was 23 and 27 months, respectively; and that in the two monkeys exposed to the virus of scrapie was 25 and 32 months, respectively. Careful physical examination of the buccal cavities of all of the monkeys failed to reveal signs or oral lesions. One additional monkey similarly exposed to kuru has remained asymptomatic during the 39 months that it has been under observation.

PMID: 6997404



http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=6997404&dopt=Abstract




12/10/76 AGRICULTURAL RESEARCH COUNCIL REPORT OF THE ADVISORY COMMITTE ON SCRAPIE Office Note CHAIRMAN: PROFESSOR PETER WILDY

snip...

A The Present Position with respect to Scrapie A] The Problem

Scrapie is a natural disease of sheep and goats. It is a slow and inexorably progressive degenerative disorder of the nervous system and it ia fatal. It is enzootic in the United Kingdom but not in all countries.

The field problem has been reviewed by a MAFF working group (ARC 35/77). It is difficult to assess the incidence in Britain for a variety of reasons but the disease causes serious financial loss; it is estimated that it cost Swaledale breeders alone $l.7 M during the five years 1971-1975. A further inestimable loss arises from the closure of certain export markets, in particular those of the United States, to British sheep.

It is clear that scrapie in sheep is important commercially and for that reason alone effective measures to control it should be devised as quickly as possible.

Recently the question has again been brought up as to whether scrapie is transmissible to man. This has followed reports that the disease has been transmitted to primates. One particularly lurid speculation (Gajdusek 1977) conjectures that the agents of scrapie, kuru, Creutzfeldt-Jakob disease and transmissible encephalopathy of mink are varieties of a single "virus". The U.S. Department of Agriculture concluded that it could "no longer justify or permit scrapie-blood line and scrapie-exposed sheep and goats to be processed for human or animal food at slaughter or rendering plants" (ARC 84/77)" The problem is emphasised by the finding that some strains of scrapie produce lesions identical to the once which characterise the human dementias"

Whether true or not. the hypothesis that these agents might be transmissible to man raises two considerations. First, the safety of laboratory personnel requires prompt attention. Second, action such as the "scorched meat" policy of USDA makes the solution of the acrapie problem urgent if the sheep industry is not to suffer grievously.

snip...

76/10.12/4.6



http://www.bseinquiry.gov.uk/files/yb/1976/10/12004001.pdf




Epidemiology of Scrapie in the United States 1977



http://www.bseinquiry.gov.uk/files/mb/m08b/tab64.pdf




http://scrapie-usa.blogspot.com/




Like lambs to the slaughter
31 March 2001
by Debora MacKenzie Magazine issue 2284

FOUR years ago, Terry Singeltary watched his mother die horribly from a degenerative brain disease. Doctors told him it was Alzheimer's, but Singeltary was suspicious. The diagnosis didn't fit her violent symptoms, and he demanded an autopsy. It showed she had died of sporadic Creutzfeldt-Jakob disease.

Most doctors believe that sCJD is caused by a prion protein deforming by chance into a killer. But Singeltary thinks otherwise. He is one of a number of campaigners who say that some sCJD, like the variant CJD related to BSE, is caused by eating meat from infected animals. Their suspicions have focused on sheep carrying scrapie, a BSE-like disease that is widespread in flocks across Europe and North America.

Now scientists in France have stumbled across new evidence that adds weight to the campaigners' fears. To their complete surprise, the researchers found that one strain of scrapie causes the same brain damage in ...



http://www.newscientist.com/article/mg16922840.300-like-lambs-to-the-slaughter.html




EVIDENCE OF SCRAPIE IN SHEEP AS A RESULT OF FOOD BORNE EXPOSURE

This is provided by the statistically significant increase in the incidence of sheep scrape from 1985, as determined from analyses of the submissions made to VI Centres, and from individual case and flock incident studies. ........



http://www.bseinquiry.gov.uk/files/yb/1994/02/07002001.pdf




P03.141

Aspects of the Cerebellar Neuropathology in Nor98

Gavier-Widén, D1; Benestad, SL2; Ottander, L1; Westergren, E1 1National Veterinary Insitute, Sweden; 2National Veterinary Institute,

Norway Nor98 is a prion disease of old sheep and goats. This atypical form of scrapie was first described in Norway in 1998. Several features of Nor98 were shown to be different from classical scrapie including the distribution of disease associated prion protein (PrPd) accumulation in the brain. The cerebellum is generally the most affected brain area in Nor98. The study here presented aimed at adding information on the neuropathology in the cerebellum of Nor98 naturally affected sheep of various genotypes in Sweden and Norway. A panel of histochemical and immunohistochemical (IHC) stainings such as IHC for PrPd, synaptophysin, glial fibrillary acidic protein, amyloid, and cell markers for phagocytic cells were conducted. The type of histological lesions and tissue reactions were evaluated. The types of PrPd deposition were characterized. The cerebellar cortex was regularly affected, even though there was a variation in the severity of the lesions from case to case. Neuropil vacuolation was more marked in the molecular layer, but affected also the granular cell layer. There was a loss of granule cells. Punctate deposition of PrPd was characteristic. It was morphologically and in distribution identical with that of synaptophysin, suggesting that PrPd accumulates in the synaptic structures. PrPd was also observed in the granule cell layer and in the white matter. The pathology features of Nor98 in the cerebellum of the affected sheep showed similarities with those of sporadic Creutzfeldt-Jakob disease in humans.

***The pathology features of Nor98 in the cerebellum of the affected sheep showed similarities with those of sporadic Creutzfeldt-Jakob disease in humans.



http://www.prion2007.com/pdf/Prion%20Book%20of%20Abstracts.pdf




PR-26

NOR98 SHOWS MOLECULAR FEATURES REMINISCENT OF GSS

R. Nonno1, E. Esposito1, G. Vaccari1, E. Bandino2, M. Conte1, B. Chiappini1, S. Marcon1, M. Di Bari1, S.L. Benestad3, U. Agrimi1 1 Istituto Superiore di Sanità, Department of Food Safety and Veterinary Public Health, Rome, Italy (mhtml:%7B33B38F65-8D2E-434D-8F9B-8BDCD77D3066%7Dmid://00000064/!x-usc:mailto:romolo.nonno@iss.it); 2 Istituto Zooprofilattico della Sardegna, Sassari, Italy; 3 National Veterinary Institute, Department of Pathology, Oslo, Norway

Molecular variants of PrPSc are being increasingly investigated in sheep scrapie and are generally referred to as "atypical" scrapie, as opposed to "classical scrapie". Among the atypical group, Nor98 seems to be the best identified. We studied the molecular properties of Italian and Norwegian Nor98 samples by WB analysis of brain homogenates, either untreated, digested with different concentrations of proteinase K, or subjected to enzymatic deglycosylation. The identity of PrP fragments was inferred by means of antibodies spanning the full PrP sequence. We found that undigested brain homogenates contain a Nor98-specific PrP fragment migrating at 11 kDa (PrP11), truncated at both the C-terminus and the N-terminus, and not N-glycosylated. After mild PK digestion, Nor98 displayed full-length PrP (FL-PrP) and N-glycosylated C-terminal fragments (CTF), along with increased levels of PrP11. Proteinase K digestion curves (0,006-6,4 mg/ml) showed that FL-PrP and CTF are mainly digested above 0,01 mg/ml, while PrP11 is not entirely digested even at the highest concentrations, similarly to PrP27-30 associated with classical scrapie. Above 0,2 mg/ml PK, most Nor98 samples showed only PrP11 and a fragment of 17 kDa with the same properties of PrP11, that was tentatively identified as a dimer of PrP11. Detergent solubility studies showed that PrP11 is insoluble in 2% sodium laurylsorcosine and is mainly produced from detergentsoluble, full-length PrPSc. Furthermore, among Italian scrapie isolates, we found that a sample with molecular and pathological properties consistent with Nor98 showed plaque-like deposits of PrPSc in the thalamus when the brain was analysed by PrPSc immunohistochemistry. Taken together, our results show that the distinctive pathological feature of Nor98 is a PrP fragment spanning amino acids ~ 90-155. This fragment is produced by successive N-terminal and C-terminal cleavages from a full-length and largely detergent-soluble PrPSc, is produced in vivo and is extremely resistant to PK digestion.

*** Intriguingly, these conclusions suggest that some pathological features of Nor98 are reminiscent of Gerstmann-Sträussler-Scheinker disease.

119



http://www.neuroprion.com/pdf_docs/conferences/prion2006/abstract_book.pdf




Here we report that both Nor98 and discordant cases, including three sheep homozygous for the resistant PrPARR allele (A136R154R171), efficiently transmitted the disease to transgenic mice expressing ovine PrP, and that they shared unique biological and biochemical features upon propagation in mice. These observations support the view that a truly infectious TSE agent, unrecognized until recently, infects sheep and goat flocks and may have important implications in terms of scrapie control and public health.

Edited by Stanley B. Prusiner, University of California, San Francisco, CA, and approved September 12, 2005 (received for review March 21, 2005)



http://www.pnas.org/cgi/content/abstract/0502296102v1




NOR-98 ATYPICAL SCRAPIE 5 cases documented in USA in 5 different states USA 2007



http://nor-98.blogspot.com/2008/04/seac-spongiform-encephalopathy-advisory.html




Tuesday, June 3, 2008 SCRAPIE USA UPDATE JUNE 2008 NOR-98 REPORTED PA



http://nor-98.blogspot.com/2008/06/scrapie-usa-update-june-2008-nor-98.html




http://nor-98.blogspot.com/




http://scrapie-usa.blogspot.com/




SCRAPIE DETECTED IN ANOTHER GOAT USA UPDATE MARCH 2009



http://scrapie-usa.blogspot.com/2009/04/scrapie-detected-in-another-goat-usa.html



Saturday, May 2, 2009


APHIS AND WHO PLAN TO EXEMPT THE ATYPICAL SCRAPIE NOR-98 FROM REGULATIONS AT MEETING THIS MONTH



http://nor-98.blogspot.com/2009/05/aphis-and-who-plan-to-exempt-atypical.html



Tuesday, April 28, 2009

Nor98-like Scrapie in the United States of America


http://nor-98.blogspot.com/2009/04/nor98-like-scrapie-in-united-states-of.html





TSS

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Wednesday, January 28, 2009

TAFS1 Position Paper on BSE in small ruminants (January 2009)

UPDATED: TAFS POSITION PAPER ON BSE IN SMALL RUMINANTS (January 2009) TAFS Position Paper - BSE in Small Ruminants- (246 kB) ??????? BSE ???? TAFS ????????? (Japanese version not updated; status May 2007)

TAFS INTERNATIONAL FORUM FOR TRANSMISSIBLE ANIMAL DISEASES AND FOOD SAFETY a non-profit Swiss Foundation

(January 2009)

TAFS1 Position Paper on BSE in small ruminants

The recognition in 2004 that a French goat killed in 2002(25) was infected with BSE raised the profile of prion diseases in small ruminants in Europe, especially with respect to the risk that this may represent to consumers. Research into BSE in small ruminants, using experimental infections of sheep with BSE, were expanded and will inevitably add to our understanding of how BSE behaves in sheep and goats if infected. Meanwhile surveillance for prion diseases in small ruminants in Europe has identified scrapie cases in most countries, sometimes only in small numbers, but the evolving process of data analysis and scientific investigation is challenging past assumptions about the recognition and behaviour of prion infections of small ruminants. In particular, there is an intensification of the search for BSE amongst positive cases detected by surveillance, making use of newer discriminatory tools. This paper summarises recent results, both published or soon to be published, and their implications to both consumers and authorities who are responsible for ensuring the protection of consumers.

please see full text 17 pages ;



http://www.tafsforum.org/position_papers/TAFS%20POSITION%20STATEMENT%20ON%20BSE%20IN%20SMALL%20RUMINANTS_2009.pdf



-------------------- mhtml:%7B33B38F65-8D2E-434D-8F9B-8BDCD77D3066%7Dmid://00000205/!x-usc:mailto:BSE-L@LISTS.AEGEE.ORG --------------------

When Atypical Scrapie cross species barriers

Authors

Andreoletti O., Herva M. H., Cassard H., Espinosa J. C., Lacroux C., Simon S., Padilla D., Benestad S. L., Lantier F., Schelcher F., Grassi J., Torres, J. M., UMR INRA ENVT 1225, Ecole Nationale Veterinaire de Toulouse.France; ICISA-INlA, Madrid, Spain; CEA, IBiTec-5, DSV, CEA/Saclay, Gif sur Yvette cedex, France; National Veterinary Institute, Postboks 750 Sentrum, 0106 Oslo, Norway, INRA IASP, Centre INRA de Tours, 3738O Nouzilly, France.

Content

Atypical scrapie is a TSE occurring in small ruminants and harbouring peculiar clinical, epidemiological and biochemical properties. Currently this form of disease is identified in a large number of countries. In this study we report the transmission of an atypical scrapie isolate through different species barriers as modeled by transgenic mice (Tg) expressing different species PRP sequence.

The donor isolate was collected in 1995 in a French commercial sheep flock. inoculation into AHQ/AHQ sheep induced a disease which had all neuro-pathological and biochemical characteristics of atypical scrapie. Transmitted into Transgenic mice expressing either ovine or PrPc, the isolate retained all the described characteristics of atypical scrapie.

Surprisingly the TSE agent characteristics were dramatically different v/hen passaged into Tg bovine mice. The recovered TSE agent had biological and biochemical characteristics similar to those of atypical BSE L in the same mouse model. Moreover, whereas no other TSE agent than BSE were shown to transmit into Tg porcine mice, atypical scrapie was able to develop into this model, albeit with low attack rate on first passage.

Furthermore, after adaptation in the porcine mouse model this prion showed similar biological and biochemical characteristics than BSE adapted to this porcine mouse model. Altogether these data indicate.

(i) the unsuspected potential abilities of atypical scrapie to cross species barriers

(ii) the possible capacity of this agent to acquire new characteristics when crossing species barrier

These findings raise some interrogation on the concept of TSE strain and on the origin of the diversity of the TSE agents and could have consequences on field TSE control measures.



http://www.neuroprion.org/resources/pdf_docs/conferences/prion2008/abstract-book-prion2008.pdf



SCRAPIE USA

INFECTED AND SOURCE FLOCKS

There were 20 scrapie infected and source flocks with open statuses (Figure 3) as of April, 30, 2008. Twenty eight new infected and source flocks have been designated in FY 2008 (Figure 4); three source flocks were reported in April. ...snip

POSITIVE SCRAPIE CASES

As of April 30, 2008, 122 new scrapie cases have been confirmed and reported by the National Veterinary Services Laboratories (NVSL) in FY 2008 (Figure 6). Of these, 103 were field cases and 19* were Regulatory Scrapie Slaughter Surveillance (RSSS) cases (collected in FY 2008 and reported by May 20, 2008). Positive cases reported for April 2008 are depicted in Figure 7. Eighteen cases of scrapie in goats have been confirmed by NVSL since implementation of the regulatory changes in FY 2002 (Figure 8). The most recent positive goat case was confirmed in February 2008 and originated from the same herd in Michigan as the other FY 2008 goat cases. ...snip

CAPRINE SCRAPIE PREVALENCE STUDY (CSPS)

snip...

However, four positive goats have been identified this fiscal year through field investigations. One was a clinical suspect submitted for testing and the other three originated from the birth herd of the clinical case.

ANIMALS SAMPLED FOR SCRAPIE TESTING

As of April 30, 2008, 26,703 animals have been sampled for scrapie testing: 23,378 RSSS, 1,517 goats for the CSPS study, 1,466 regulatory field cases, 270 regulatory third eyelid biopsies, and 72 regulatory rectal biopsies (chart 8).

TESTING OF LYMPHOID TISSUE OBTAINED BY RECTAL BIOPSY WAS APPROVED BY USDA AS AN OFFICIAL LIVE-ANIMAL TEST ON JANUARY 11, 2008. ...

PLEASE NOTE, (FIGURE 6), Scrapie Confirmed Cases in FY 2008 MAP, PA 3, 1**, Two cases-state of ID UNKNOWN, 1 case Nor98-like**



http://www.aphis.usda.gov/animal_health/animal_diseases/scrapie/downloads/monthly_scrapie_rpt.pps



http://scrapie-usa.blogspot.com/



P03.141

Aspects of the Cerebellar Neuropathology in Nor98

Gavier-Widén, D1; Benestad, SL2; Ottander, L1; Westergren, E1 1National Veterinary Insitute, Sweden; 2National Veterinary Institute,

Norway Nor98 is a prion disease of old sheep and goats. This atypical form of scrapie was first described in Norway in 1998. Several features of Nor98 were shown to be different from classical scrapie including the distribution of disease associated prion protein (PrPd) accumulation in the brain. The cerebellum is generally the most affected brain area in Nor98. The study here presented aimed at adding information on the neuropathology in the cerebellum of Nor98 naturally affected sheep of various genotypes in Sweden and Norway. A panel of histochemical and immunohistochemical (IHC) stainings such as IHC for PrPd, synaptophysin, glial fibrillary acidic protein, amyloid, and cell markers for phagocytic cells were conducted. The type of histological lesions and tissue reactions were evaluated. The types of PrPd deposition were characterized. The cerebellar cortex was regularly affected, even though there was a variation in the severity of the lesions from case to case. Neuropil vacuolation was more marked in the molecular layer, but affected also the granular cell layer. There was a loss of granule cells. Punctate deposition of PrPd was characteristic. It was morphologically and in distribution identical with that of synaptophysin, suggesting that PrPd accumulates in the synaptic structures. PrPd was also observed in the granule cell layer and in the white matter. The pathology features of Nor98 in the cerebellum of the affected sheep showed similarities with those of sporadic Creutzfeldt-Jakob disease in humans.

***The pathology features of Nor98 in the cerebellum of the affected sheep showed similarities with those of sporadic Creutzfeldt-Jakob disease in humans.



http://www.prion2007.com/pdf/Prion%20Book%20of%20Abstracts.pdf



Here we report that both Nor98 and discordant cases, including three sheep homozygous for the resistant PrPARR allele (A136R154R171), efficiently transmitted the disease to transgenic mice expressing ovine PrP, and that they shared unique biological and biochemical features upon propagation in mice. These observations support the view that a truly infectious TSE agent, unrecognized until recently, infects sheep and goat flocks and may have important implications in terms of scrapie control and public health.

Edited by Stanley B. Prusiner, University of California, San Francisco, CA, and approved September 12, 2005 (received for review March 21, 2005)



http://www.pnas.org/cgi/content/abstract/0502296102v1



NOR-98 ATYPICAL SCRAPIE 5 cases documented in USA in 5 different states USA 007



http://nor-98.blogspot.com/2008/04/seac-spongiform-encephalopathy-advisory.html



Tuesday, June 3, 2008 SCRAPIE USA UPDATE JUNE 2008 NOR-98 REPORTED PA



http://nor-98.blogspot.com/2008/06/scrapie-usa-update-june-2008-nor-98.html



http://nor-98.blogspot.com/



Monday, December 1, 2008 When Atypical Scrapie cross species barriers



http://nor-98.blogspot.com/2008/12/when-atypical-scrapie-cross-species.html




Saturday, January 24, 2009 Research Project: Detection of TSE Agents in Livestock, Wildlife, Agricultural Products, and the Environment Location: 2008 Annual Report



http://bse-atypical.blogspot.com/2009/01/research-project-detection-of-tse.html




TSS

Labels: , , ,