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How long did it take us to discover that #HIV first infected humans half a century before western scientists noticed it?
As in the current dominant #HIV1 strain first went from chimps to humans in about the #1920s
There's been multiple #spillover events from multiple species, so this has probably been happening for 1000s of years? (but older #spillovers didn't get far because it's not very contagious)
tweeted https://twitter.com/evolving_string/status/1635681501965864960