According to an article released on October 30th, 2007 entitled, "Out Of Africa: HIV's Path From Haiti To The US Then The World", it has been shown with high probability that HIV probably traveled to Haiti from Central Africa before infecting in the US.
Within this research it was also identified that HIV probably arrived in the US earlier than previously believed. Michael Worobey, an assistant professor of ecology and evolutionary biology at The University of Arizona in Tucson and senior author of this research is quoted:
"Our results show that the strain of virus that spawned the U.S. AIDS epidemic probably arrived in or around 1969. That is earlier than a lot of people had imagined."
"Haiti was the stepping stone the virus took when it left central Africa and started its sweep around the world...Once the virus got to the U.S., then it just moved explosively around the world."
Interesting that there is still so much to find out about the epidemiology of a virus that is studied by so so many people today!
check it out: