Although it has existed for centuries, hepatitis C was identified just over 20 years ago, and scientists have been puzzling about its origins ever since. In May, Columbia University Medical Center pathologist W. Ian Lipkin and his colleagues identified a hepatitis C–like virus in dogs for the first time, suggesting the disease may have jumped to humans through contact with man’s best friend 500 to 1,000 years ago, long after dogs were first domesticated.
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