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Just a personal observation - it would be pretty surprising if an industry THAT large with THAT many cattle didn't have as many mad cow instances as the smaller Canadian industry, even accounting for lesser preventative measures that allowed for a greater incident rate in Canada.
Cowperson
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My understanding was Canada actually has much better measures, as well as better testing, tracking and screening. This as much as anything probably explains why we have had more cases FOUND. Also, I have heard from people that call themselves experts on the subject that there is a spontaneous incidence rate of about 1 per million. I think there are 3 million cows in Canada.