See:
https://www.theatlantic.com/science/...covery/596272/

"The place, most likely: southern Cameroon. The estimated time: the 1920s. There and then, a chimpanzee virus hopped into some unlucky person, before making its way to the city now known as Kinshasa. In a populous and growing hub with a multitude of hosts, the new virus gained ground, eventually spawning lineages that spread around the world."