History of HIV/AIDS
HIV was identified in 1983 and is surprisingly old. The cases of AIDS are divided into 3 groups and have "debuted" in humans at least three separate times. The virus had jumped from Cameroon chimps to humans sometime before 1931. Using samples of HIV-infected tissue harvested over the last 3 decades, Dr. Bette Korber of Los Alamos National Laboratory has calculated that an ancestral form of HIV started spreading slowly in humans about 75 years ago. HIV can also be transmitted during sexual contact, pregnancy, childbirth, breastfeeding, injection drug use, ect.