This is a timeline of HIV/AIDS, including but not limited to cases before 1980. == Pre-1980s == Researchers estimate that some time in the early 20th century, a form of Simian immunodeficiency virus found in chimpanzees (SIVcpz) first entered humans in Central Africa and began circulating in Léopoldville (modern-day Kinshasa) by the 1920s.
This is a timeline of HIV/AIDS, including but not limited to cases before 1980. == Pre-1980s == Researchers estimate that some time in the early 20th century, a form of Simian immunodeficiency virus found in chimpanzees (SIVcpz) first entered humans in Central Africa and began circulating in Léopoldville (modern-day Kinshasa) by the 1920s.
Source: Wikipedia "Timeline of HIV/AIDS" · CC BY-SA 4.0
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