In the early days of AIDS, the disease was referred to by the CDC as the 4H disease, due to their high infection among hemophiliacs, homosexuals, heroin users, and Haitians. The first three groups are susceptible to AIDS via straightforward blood or sex transmission. What caused the Haitian cluster?
Gays, escaping from persecution during the civil war in Haiti, went hog wild when they discovered how liberal New York and Miami were compared to strictly Catholic Haiti. This caused a small upswing in AIDS incidence, which had been declining before the Haitian asylum occurred.
US Government officials at the time wanted to promote the idea that AIDS was not just a gay disease and that it affected heterosexuals, as well, for political reasons. The Haitian upswing provided them the opportunity to do this. They made a regulation which forbade doctors from asking Haitians (and only Haitians) whether they were gay, and required doctors to check the "Heterosexual" box on the disease form unless the patient volunteered the information that he was gay.
The government then exaggerated and publicized the new "heterosexual AIDS epidemic" as much as they could.