My understanding is that HIV is epidemic in black Africans in much of sub-Sahara Africa, and that cheap anti-retroviral drugs are the only thing preventing a massive die-off. Prevalence is almost entirely due to sexual transmission. The sexual promiscuity of these people is well-documented in the public health literature; it's quite an interesting story, medically speaking...
Last edited by DocRocket; 09/10/15.
