According to the Centers for Disease Control, there are a number of interesting facts regarding transgenderism and HIV. In total, they are three times more likely than the national average to receive a new diagnosis of the disease. Stigma and discrimination, factors which affect transgender people more than other groups, are often cited as the reason for the higher percentages.
In one study, 84% of those diagnosed were transgender women and 15% were transgender men. (1% were gender nonconforming.) Included in those numbers are the facts that as many as 14% of transgender women have HIV, with blacks making up nearly half of those numbers. (No surprise that the southern U.S. accounts for more cases than any either geographical region.)