“Actually, in DC among Blacks between 15 and 55, the HIV infection rate is about 1 in 10.”
I find that statistic very difficult to believe. If the incidence was that high, simple geometric progression would have the rate close to 100% in no time.
From 2012:
http://articles.washingtonpost.com/2012-06-20/national/35459333_1_hiv-infection-infection-rate-care-within-three-months
Infection rates of women in Wards 7 and 8 was over 12%
From 2008:
http://www.pbs.org/newshour/bb/health/july-dec08/aidsdc_08-05.html
Five percent of the entire population of DC is HIV positive.
From 2009:
http://www.time.com/time/health/article/0,8599,1885601,00.html
Seven percent of all Black males in DC are HIV positive.
The large majority of those infected are between the ages of 15 and 55, giving that cohort a higher percentage than the general population.