|Miller, Janice - ARS RETIRED|
Submitted to: International Veterinary Vaccines and Diagnostics Conference
Publication Type: Abstract Only
Publication Acceptance Date: March 15, 2006
Publication Date: June 25, 2006
Citation: Hamir, A.N., Kunkle, R.A., Miller, J.M., Greenlee, J.J., Richt, J.A. 2006. Experimental transmission of transmissible mink encephalopathy (TME) to cattle by intracerebral inoculation [abstract]. 4th International Veterinary Vaccines and Diagnostics Conference. p. 89. Paper No. PO53. Technical Abstract: To compare clinicopathological findings of transmissible mink encephalopathy (TME) with other transmissible spongiform encephalopathies (TSE, prion diseases) that have been shown to be experimentally transmissible to cattle (sheep scrapie, and chronic wasting disease, CWD), 2 groups of calves (n = 4 each) were intracerebrally inoculated with TME agents from 2 different sources (mink with TME and a bovine with TME). Two uninoculated calves served as controls. Within 15.3 months post inoculation (PI), all animals from both inoculated groups developed clinical signs of central nervous system (CNS) abnormality; their CNS tissues had microscopic spongiform encephalopathy (SE); and PrP**res was detected in their CNS tissues by immunohistochemistry (IHC) and Western blot (WB) techniques. These findings demonstrate that intracerebrally inoculated cattle not only amplify TME PrP**res but also develop clinical CNS signs and extensive lesions of SE. The latter has not been shown with other TSE agents (scrapie and CWD) similarly inoculated into cattle. The findings also suggest that the diagnostic techniques currently used for confirmation of bovine spongiform encephalopathy (BSE) would detect TME in cattle should it occur naturally. However, it would be a diagnostic challenge to differentiate TME in cattle from BSE. Our recent preliminary results indicate that WB may be able to differentiate between bovine TME and BSE.