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It's been optimally selected for human infection by testing different infection strategies in humanized mice with gain-of-function research. The furin cleavage site is not found in any other coronavirus https://thebulletin.org/2021/05/the-origin-of-covid-did-people-or-nature-open-pandoras-box-at-wuhan/ …pic.twitter.com/eyRE688zaX
Yes, I know, that too. But I‘m trying to make a slightly different point. I doubt this is the first leak from that lab. It was just the first one that spread well in hospitals.
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