Scientists Worry Mad Cow Cases Could Be Variants

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Some aspects of two recent cases of mad cow disease in the U.S. don't seem to fit the profile. That worries some scientists. They're concerned that a variant form of the brain-wasting disease could be on the rise.


Mo Salman, professor of epidemiology; director of Animal Population Health Institute; College of Veterinary Medicine and Biomedical Sciences, Colorado State University



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