The disease was found in a Holstein cow, which could not move on its own, from a farm in Mabton, Wash., about 40 miles southeast of Yakima. Tissue samples were taken on Dec. 9, and eventually tested positive for BSC. Parts of the cow that would be infected — the brain, the spinal cord and the lower part of the small intestine — were removed before the animal went to a meat processing plant — standard operating procedure in this country.
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http://story.news.yahoo.com/news?tmpl=story&u=/ap/20031224/ap_on_he_me/mad_cow&cid=541&ncid=716