This study of over 7000 US blood donors found of 2000 samples donated between Dec 13 and Dec 16, 2019 in California, Washington and Oregan, 2% tested positive for SARS-CoV-2 antibodies.
As there is a period of at least 3 to 4 weeks after infection before antibodies can be detected these samples were all people who were infected before November 2019 and to use them as a representative sample, it would say there were well over 600,000 cases across the United States BEFORE November 2019.
The study also looked at over 5000 blood samples donated in Massachusettes, Wisconsin, Iowa, Connecticut, Rhode Island and Michigan between Dec 30 and January 17, 2020 and found 1.2% of these tested positive for SARS-CoV-2 antibodies. If they were used as a representative sample it would say there were 400,000 cases across the United States before December 2019.
Looking at both of those groups representing a swathe of the united states from coast to coast, I think we can say with confidence that somewhere between 400,000 and 600,000 cases of SARS-CoV-2 infection had already occured in the US well before November 2019. Obviously it would have taken months to spread that far and to so many people across an entire continent so pretty much everything we were told in 2020 about the origin and the spread of the virus was complete nonsense.
https://academic.oup.com/cid/article/72/12/e1004/6012472
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