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Comparison of Retropharyngeal Lymph Node and Obex Region of the Brainstem in Detection of Chronic Wasting Disease in White-Tailed Deer (Odocoileus Virginianus)

Chronic wasting disease (CWD) in Wisconsin was first identified in February 2002. By April 2005. medial retropharyngeal lymph node (RLN) tissues had been examined from over 75,000 white-tailed deer for the presence of CWD by either immunohistochemical (IHC) staining for the prion protein associated with CWD (PrPres) or by using enzyme-linked immunosorbent assays with confirmation of positives by IHC staining and had been detected in 469 animals. Obex tissue was also available from 438 of the CWD-positive animals and was CWD positive by IHC staining in 355 (81%). To verify whether false-negative results were possible examining only RLN, both obex and RLN samples were examined for CWD by IHC staining from 4,430 of the white-tailed deer harvested from an area in Wisconsin where the overall deer CWD prevalence was approximately 6.2%. Two hundred and fourteen of the 269 positive deer (79.6%) had deposits of PrPres in both obex and lymphoid tissues. 55 (20.4%) had deposits only in lymphoid tissue, and there were no deer that had deposits only in obex.