AIDS - Origin and the Path to the West
As we saw, AIDS hit the West in the 1980’s. In his awesome book, Spillover , David Quammen gets into how it came out of Africa. That story starts off with a heated debate between two theories on the origin of HIV in humans: (1) the cut-hunter theory that said assumed a hunter killed an African primate, and got infected due to a wound/cut in his body; v/s (2) the polio-vaccine theory that blamed contaminated vaccines which had been tested on Africans in 1957-60. To test the polio-vaccine theory, Dirk Teuwen went to the Congo to test one of the earliest HIV-1 samples from 1960. It was improbable anything would have survived that long, but as luck would have it, those samples had been preserved in just the right way. That strain was given the name DRC60. It was compared against another strain named ZR59. The two strains were very different: “Every virus has its own rate (of mutation)… The amount of difference between two viral strains can therefore reveal how much time has...