{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,16]],"date-time":"2025-10-16T19:55:51Z","timestamp":1760644551367},"reference-count":32,"publisher":"American Society for Microbiology","issue":"5","license":[{"start":{"date-parts":[[2002,9,1]],"date-time":"2002-09-01T00:00:00Z","timestamp":1030838400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["Clin Vaccine Immunol"],"published-print":{"date-parts":[[2002,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:p>Control of scrapie, an ovine transmissible spongiform encephalopathy or prion disorder, has been hampered by the lack of conventional antemortem diagnostic tests. Currently, scrapie is diagnosed by postmortem examination of the brain and lymphoid tissues for PrP<jats:sup>Sc<\/jats:sup>, the protein marker for this group of disorders. For live, asymptomatic sheep, diagnosis using tonsil or third-eyelid lymphoid tissue biopsy and PrP<jats:sup>Sc<\/jats:sup>assay has been described. To evaluate the feasibility and efficacy of third-eyelid testing for identification of infected flocks and individual infected sheep, 690 sheep from 22 flocks were sampled by third-eyelid lymphoid tissue biopsy and immunohistochemistry. Sheep were further evaluated for relative genetic susceptibility and potential contact exposure to scrapie. Third-eyelid testing yielded suitable samples for 80% of the sheep tested, with a mean of 18.1 lymphoid follicles (germinal centers) per histologic section. Three hundred eleven of the sheep were sampled through passive surveillance programs, in which only sheep with potential contact with an infected sheep at a lambing event were tested, regardless of their scrapie susceptibility genotype. In addition, 141 genetically susceptible sheep with no record of contact with an infected animal at a lambing event were sampled through a targeted active surveillance program. Ten PrP<jats:sup>Sc<\/jats:sup>-positive sheep were identified through the passive surveillance program, and an additional three PrP<jats:sup>Sc<\/jats:sup>-positive sheep, including two from flocks with no history of scrapie, were identified through the active surveillance program. All PrP<jats:sup>Sc<\/jats:sup>-positive sheep had the highly susceptible PrP genotype. Third-eyelid testing is a useful adjunct to flock monitoring programs, slaughter surveillance, and mandatory disease reporting in a comprehensive scrapie eradication and research program.<\/jats:p>","DOI":"10.1128\/cdli.9.5.966-971.2002","type":"journal-article","created":{"date-parts":[[2002,8,30]],"date-time":"2002-08-30T18:44:29Z","timestamp":1030733069000},"page":"966-971","update-policy":"http:\/\/dx.doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["Active Surveillance for Scrapie by Third Eyelid Biopsy and Genetic Susceptibility Testing of Flocks of Sheep in Wyoming"],"prefix":"10.1128","volume":"9","author":[{"given":"Katherine I.","family":"O'Rourke","sequence":"first","affiliation":[{"name":"Animal Disease Research Unit, Agricultural Research Service, Pullman, Washington"},{"name":"Veterinary Services, Animal and Plant Health Inspection Service, Casper"},{"name":"Veterinary Services, Animal and Plant Health Inspection 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Cheyenne"},{"name":"Wyoming State Veterinary Laboratory"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Anne K.","family":"Anderson","sequence":"additional","affiliation":[{"name":"Animal Disease Research Unit, Agricultural Research Service, Pullman, Washington"},{"name":"Veterinary Services, Animal and Plant Health Inspection Service, Casper"},{"name":"Veterinary Services, Animal and Plant Health Inspection Service"},{"name":"Wyoming Livestock Board, Cheyenne"},{"name":"Wyoming State Veterinary Laboratory"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dianne K.","family":"Norden","sequence":"additional","affiliation":[{"name":"Animal Disease Research Unit, Agricultural Research Service, Pullman, Washington"},{"name":"Veterinary Services, Animal and Plant Health Inspection Service, Casper"},{"name":"Veterinary Services, Animal and Plant Health Inspection Service"},{"name":"Wyoming Livestock Board, Cheyenne"},{"name":"Wyoming State Veterinary 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