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A mad cow in America

A dairy cow in California is the fourth known American case of mad cow disease, which is caused by prions, infectious agents composed only of protein (the story hit the press the day after my lecture on this type of illness). Unlike viruses, prions have no nucleic acid and no protective coat. But virologists know all about them because, as Stanley Prusiner once said, there was a time when only virologists believed that they existed.

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