How HIV spread across North America (IMAGE)

University of Arizona

How HIV spread across North America

Caption

After HIV moved from Africa to the Caribbean, it first spread to New York and subsequently to different locations in the U.S. By constructing evolutionary trees of the various HIV strains as far back as the 1970s, the researchers found evidence that the virus had been circulating under the radar for ten years before the outbreak in the US was recognized.

Credit

Worobey <i>et al</i>./<i>Nature</i>

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