Patrick States slices into a venison steak at his home in Northglenn, Colo. Officials are asking hunters to have their kills tested before consuming the meat. Sam Brasch/Colorado Public Radio hide caption
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mad cow disease
In 1962, a local leader in the Eastern Highlands of Papua New Guinea asks Fore men to stop the sorcery that he believes is killing women and children. Courtesy Shirley Lindenbaum hide caption
Colored brain scan of a 17-year-old boy with mad cow disease. The bright yellow spots are a sign that the thalamus is damaged by diseased proteins. Simon Fraser/Science Source hide caption
Prion protein can be infectious, spreading from cell to cell in the brain. Here four nerve cells in a mouse illustrate how infectious prion protein moves within cells along neurites — wire-like connections the nerve cells use for communicating with adjacent cells. Science Source hide caption
Mad Cow Research Hints At Ways To Halt Alzheimer's, Parkinson's
Cattle feeding practices have been changed in an effort to halt the spread of mad cow disease. iStockphoto.com hide caption