Security guards stand in front of the Huanan Seafood Wholesale Market in Wuhan, China, on Jan. 11, 2020, after the market had been closed following an outbreak of COVID-19 there. Two new studies document samples of SARS-CoV-2 from stalls where live animals were sold. (Noel Celis/AFP via Getty Images)
This article was originally published on March 03, 2022.