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Infectious agent of sheep scrapie may persist in the environment for at least 16 years

Gudmundur Georgsson,1 Sigurdur Sigurdarson2 and Paul Brown3
1Institute for Experimental Pathology, University of Iceland, Keldur v/vesturlandsveg, IS-112 Reykjav ́ık, Iceland

2Laboratory of the Chief Veterinary Officer, Keldur, Iceland 3Bethesda, Maryland, USA

In 1978, a rigorous programme was implemented to stop the spread of, and subsequently eradicate, sheep scrapie in Iceland. Affected flocks were culled, premises were disinfected and, after 2-3 years, restocked with lambs from scrapie-free areas.

Between 1978 and 2004, scrapie recurred on 33 farms.

Nine of these recurrences occurred 14-21 years after culling, apparently as the result of environmental contamination, but outside entry could not always be absolutely excluded.

Of special interest was one farm with a small, completely self-contained flock where scrapie recurred 18 years after culling, 2 years after some lambs had been housed in an old sheep- house that had never been disinfected.

Epidemiological investigation established with near certitude that the disease had not been introduced from the outside and it is concluded that the agent may have persisted in the old sheep-house for at least 16 years.

*** Infectious agent of sheep scrapie may persist in the environment for at least 16 years ***

*** Nine of these recurrences occurred 14-21 years after culling, apparently as the result of environmental contamination, but outside entry could not always be absolutely excluded. ***

http://www.microbiologyresearch.org...est&checksum=58C332F284CBFF0B801E821285D8E76A

***> PLEASE WATCH THIS VIDEO, AND BE SURE TO SEE AROUND THE 8 MINUTE MARK, VERY, VERY, DISTURBING...terry


LISTEN TO THIS NICE LITTLE CWD BLUES DIDDY BY TAMI ABOUT WISCONSIN CWD TSE PRION. WOW, ANNUAL UPDATES NOW, FROM HERE ON OUT, ABOUT CWD...200,000 CWD TESTS, WITH OVER 3500 CWD POSITIVE CASES, SEEING INCREASING TRENDS IN PREVALENCE AND DISTRIBUTION...CARCASS DISPOSAL SIGNIFICANT CHALLENGE...CWD SAMPLING EFFORTS GONE DONE, WHILE CWD POSITIVES HAVE GONE UP...ALSO, 40 SELF SERVING KIOSKS ACROSS STATE AND FREE HUNTER SERVICE CWD TESTING AND SICK DEER POLICY REPORTING AND TESTING ACROSS STATE!

***> LISTEN TO THIS CWD BLUES DIDDY ABOUT WISCONSIN CWD TSE PRION...terry


TUESDAY, APRIL 17, 2018

***> Chronic wasting disease: Bambi vs. the prion <***

Research Project: Immunodiagnostics to Detect Prions and Other Important Animal Pathogens

Location: Produce Safety and Microbiology Research

http://chronic-wasting-disease.blogspot.com/2018/04/chronic-wasting-disease-bambi-vs-prion.html

FRIDAY, APRIL 20, 2018

***> Scrapie Transmits To Pigs By Oral Route

what about the terribly flawed USA tse prion feed ban?

Research Project: Pathobiology, Genetics, and Detection of Transmissible Spongiform Encephalopathies

http://scrapie-usa.blogspot.com/2018/04/scrapie-transmits-to-pigs-by-oral-route.html

TUESDAY, APRIL 24, 2018

ARS Research atypical Nor98 and Michigan Scrapie, CWD, CJD and mad cow feed

Research Project: Genetic Impact and Improved Diagnostics for Sheep and Goat Transmissible Spongiform Encephalopathies

http://nor-98.blogspot.com/2018/04/ars-research-atypical-nor98-and.html

Terry
 
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