The CDC’s Dr. Thornburg and Josh Denny, chief executive of the NIH’s All of Us program and an author of the latest study, both said they don’t plan to search blood samples earlier than December 2019, given how few they have found back then. “We’ve seen a very low rate of positivity in this time period,” [1]
[1]https://www.wsj.com/articles/covid-19-virus-ranged-from-illi...
Why not sample earlier blood and see how far back COVID originated.