Virology: Early Infection, Late Disease

Each year since the 1930s, an estimated 35,000 Americans have fallen victim to Parkinson's disease, or "shaking palsy." Each year, scores of the Chamorros of Guam develop some of the symptoms of Parkinson's, along with a form of muscle degeneration best known in the U.S. as "Lou Gehrig's disease." Just as regularly, hundreds of sheep in a score of different countries begin rubbing their backs against barbed wire, ruining their wool and revealing themselves as victims of scrapie. On North American fur farms, mink of many colors get sick with a sort...

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