While research shows SARS-CoV-2 wasn't made in a lab, its emergence in the same city as the WIV has raised suspicions and inspired widespread speculation. Even if it evolved naturally, for example, a popular theory suggests the virus could have escaped after researchers collected it from the wild.

After an in-depth analysis of the genetic material from hundreds of swabs taken from the walls, floors, machines and drains inside the Huanan Seafood Wholesale Market in Wuhan, China — a site that’s been described as an epicenter of early spread of Covid-19 — scientists say they now know exactly which species of animals were in the same area where investigators also found the most positive samples the virus that causes Covid-19.

A recent international study offers new insights into the wildlife species likely present at the Wuhan market where SARS-CoV-2, the virus behind the COVID-19 pandemic, is believed to have emerged in late 2019.