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Tracing One Branch of a Pandemic

Scientists follow genetic markers to identify the origins of a widespread strain of the AIDS virus, HIV-1 subtype B.

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Scientists Track Time and Place of HIV's Arrival
Article | In the decades since young gay men in the United States started dying from a mysterious syndrome in the 1980s, scientists have wondered how and when the AIDS virus arrived. Many scenarios have been proposed, including one early but now-discounted theory that the disease was imported by a promiscu...

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