Scientists Worry Mad Cow Cases Could Be Variants

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.

Guest:

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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