The researcher, Michael Worobey of the University of Arizona, has put together a painstaking timeline of all the known cases of SARS-Cov-2 before it was known a pandemic was starting.
He found many were in people who lived or worked near the market, the original suspected source of the pandemic, even if they didn’t have direct links to the market.
But as Chinese government officials sought to deflect blame, and as the Trump administration and, later, intelligence officials in the Biden administration
, pointed to the possibility of a virology research lab in Wuhan, the picture has become muddled.
Worobey, who specializes in tracing the genetic evolution of viruses, has found considerable evidence that the virus arose in an animal,
and did not start circulating until the end of 2019. He has published multiple studies on the probable origins of the virus. But he said he wanted to check his own theories against the real-life evidence from what was known…