Haitians in the US were discriminated against on the belief that they were bringing AIDS into the country. But medical anthropologist Paul Farmer has done a good job of showing that Haitians were only more "susceptible" to the virus than other populations because American sex tourists often visited Haiti and inadvertently spread the disease to Haitian sex workers.

http://www.amazon.com/AIDS-Accusation-Haiti-Geography-Blame/...