The United States Government handled the rise of HIV/AIDS in the 1980's extremely poorly. They handled it with extreme prejudice towards the gay community, and cut funding for research for a cure. Members of the Conservative community went so far as to say things like "it's God's punishment for their sins. Even when word was spread that it wasn't a disease of the homosexuals and drug users, Americans still looked the other way, and allowed it to spread to uncontrollable levels.
In Uganda and Thailand, this was much different. The governments stepped up to fight the spread of the disease, offering PSA's warning about the disease and trying to educate their people about safe sex. If the United States had reacted this way, it may not have reached the same level of epidemic.