19

Percent of gay men who have HIV in 21 major American cities

44

Percent of those gay men with HIV who do not know it

28

Percent of black gay and bi men who are HIV positive, compared to 18 percent of Hispanic and 16 percent of white men

63

Percent of HIV-positive men under 30 in the study who did not know their status

By the numbers: HIV in America

Source: CDC study released Sept. 23, 2010