AIDS virus invaded US from Haiti

chinadaily: "The AIDS virus invaded the United States in about 1969 from Haiti, carried most likely by a single infected immigrant who set the stage for it to sweep the world in a tragic epidemic, scientists said on Monday. The AIDS virus invaded the United States in about 1969 from Haiti, carried most likely by a single infected immigrant who set the stage for it to sweep the world in a tragic epidemic, scientists said on Monday. Michael Worobey, a University of Arizona evolutionary biologist, said the 1969 US entry date is earlier than some experts had believed."