That’s a lot earlier than I thought.
I knew about the HIV-tainted blood and tissue from Kinshasa, Congo, in 1959 and 1960. Sequencing those samples back, it turns out that they were born around 1904.
Previous research has shown that HIV jumped from monkeys to man in Southeastern Cameroon. Contrary to what the racists say, no one thinks it was due to Black guys screwing monkeys. Racists are so stupid! African guys will just about screw anything, I think, but I’ve never heard of them boning monkeys. The traditional thinking is that Africans kill monkeys for food and butcher them up before they eat them. They get monkey blood all themselves when they do this. Presumably, this is how the species jump (SIV -> HIV) occurred.
HIV must have gone on very low simmer for decades until it finally started breaking out in the Kinshasa region around 1960.