Daniel808
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Type A was found in China as well... difference is, it didn't persist in China. How can you say it came from USA.
How did it pass to the Americans?
Don't stir the research
Forster and colleagues found that the closest type of COVID-19 to the one discovered in bats -- type 'A', the "original human virus genome" -- was present in Wuhan, but surprisingly was not the city's predominant virus type.
Mutated versions of 'A' were seen in Americans reported to have lived in Wuhan, and a large number of A-type viruses were found in patients from the US and Australia.
https://www.sciencedaily.com/releases/2020/04/200409085644.htm