Zoonotic Potential of CWD Prions

Discussion in 'Whitetail Deer Disease' started by terry, Jun 10, 2015.

  1. terry

    terry Banned

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    O18

    Zoonotic Potential of CWD Prions

    Liuting Qing1, Ignazio Cali1,2, Jue Yuan1, Shenghai Huang3, Diane Kofskey1, Pierluigi Gambetti1, Wenquan Zou1, Qingzhong Kong1 1Case Western Reserve University, Cleveland, Ohio, USA, 2Second University of Naples, Naples, Italy, 3Encore Health Resources, Houston, Texas, USA

    Chronic wasting disease (CWD) is a widespread and expanding prion disease in free-ranging and captive cervid species in North America. The zoonotic potential of CWD prions is a serious public health concern. Current literature generated with in vitro methods and in vivo animal models (transgenic mice, macaques and squirrel monkeys) reports conflicting results. The susceptibility of human CNS and peripheral organs to CWD prions remains largely unresolved. In our earlier bioassay experiments using several humanized transgenic mouse lines, we detected protease-resistant PrPSc in the spleen of two out of 140 mice that were intracerebrally inoculated with natural CWD isolates, but PrPSc was not detected in the brain of the same mice. Secondary passages with such PrPSc-positive CWD-inoculated humanized mouse spleen tissues led to efficient prion transmission with clear clinical and pathological signs in both humanized and cervidized transgenic mice. Furthermore, a recent bioassay with natural CWD isolates in a new humanized transgenic mouse line led to clinical prion infection in 2 out of 20 mice. These results indicate that the CWD prion has the potential to infect human CNS and peripheral lymphoid tissues and that there might be asymptomatic human carriers of CWD infection.

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    ***These results indicate that the CWD prion has the potential to infect human CNS and peripheral lymphoid tissues and that there might be asymptomatic human carriers of CWD infection.***

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    https://prion2015.files.wordpress.com/2015/05/programguide1.pdf

    I strenuously once again urge the FDA and its industry constituents, to make it MANDATORY that all ruminant feed be banned to all ruminants, and this should include all cervids as soon as possible for the following reasons...

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    In the USA, under the Food and Drug Administrations BSE Feed Regulation (21 CFR 589.2000) most material (exceptions include milk, tallow, and gelatin) from deer and elk is prohibited for use in feed for ruminant animals. With regards to feed for non-ruminant animals, under FDA law, CWD positive deer may not be used for any animal feed or feed ingredients. For elk and deer considered at high risk for CWD, the FDA recommends that these animals do not enter the animal feed system.

    ***However, this recommendation is guidance and not a requirement by law.

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    31 Jan 2015 at 20:14 GMT

    *** Ruminant feed ban for cervids in the United States? ***

    31 Jan 2015 at 20:14 GMT

    http://www.plosone.org/annotation/listThread.action?root=85351

    http://chronic-wasting-disease.blogspot.com/

    Friday, May 22, 2015

    *** Chronic Wasting Disease and Program Updates - 2014 NEUSAHA Annual Meeting 12-14 May 2014 ***

    http://chronic-wasting-disease.blogspot.com/2015/05/chronic-wasting-disease-and-program.html

    Saturday, May 30, 2015

    PRION 2015 ORAL AND POSTER CONGRESSIONAL ABSTRACTS

    https://prion2015.files.wordpress.com/2015/05/prion2015abstracts.pdf

    http://transmissiblespongiformencephalopathy.blogspot.com/2015/05/prion-2015-oral-and-poster.html

    TSS

    Wednesday, June 10, 2015

    Zoonotic Potential of CWD Prions

    LATE-BREAKING ABSTRACTS

    http://chronic-wasting-disease.blogspot.com/2015/06/zoonotic-potential-of-cwd-prions.html
     
  2. terry

    terry Banned

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    Influence of habitat and demographic components on exposure to chronic wasting disease in white-tailed deer in the eastern United States

    W. David Walter1, Tyler Evans2 1U.S. Geological Survey, University Park, Pennsylvania, USA, 2Pennsylvania Cooperative Fish and Wildlife Research Unit, University Park, Pennsylvania, USA

    Chronic wasting disease (CWD) is a transmissible spongiform encephalopathy that was first detected in the northeastern United States in 2005 in New York and West Virginia, and has since been found in Maryland, Virginia, and Pennsylvania. We examined demographic and environmental factors in the central Appalachian region to assess the spatial distribution of CWD in white-tailed deer (Odocoileus virginianus). The objectives of our study were to (1) apply Bayesian hierarchical modeling to harvest location data of white-tailed deer tested for CWD in the region since 2005, (2) identify model(s) that best described the spatial distribution of CWD, and (3) map probability of CWD infection across the Northeast. For each deer, environmental covariates were extracted within 6 km2 grid cells as this size reflected our estimate of the 99% size of home range for white-tailed deer in the region. The model with the most support did not include sex and age but contained random spatial effects and percent habitat and accounted for 94.4% of the overall weight for the candidate set of models. Percent forest cover appeared to have the strongest correlation with the distribution of CWD in the region, with increased risk of CWD occurring in areas that had lower amounts of forest cover. Our results also suggest that the use of age and sex data collected from harvested animals, commonly used in CWD modeling, should be further evaluated considering most are adult males, however, <2 year old deer are commonly diagnosed with CWD in the region.

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    https://prion2015.files.wordpress.com/2015/05/programguide1.pdf