There are over 2,000 AIDS cases per 100,000 people in DC. In other urban areas it isn’t uncommon to be over 200 cases per 100,000. Other places with high instances are places where there tend to be a lot of illegal aliens.
That actually works out to be about 1 in 20 of sexually active blacks in DC. I’m a juco teacher in the DC metro area, so I’m very aware that the Baltimore-DC area has the nation’s highest rates of STD’s. I have to figure that at any one time, I’ve got 1 student with AIDS, 1 with syph, 3 with the clap, and another 3 with a combo of the other STD’s, excluding herpes, of course, which I imagine they’ve all got.