He has called on China to share information about animals sold at a market in Wuhan that was linked to some of the earliest known cases of people infected with the virus, though not the first one. Lucey has raised questions about whether the market was, in fact, where the virus spilled over from animals to people. The limited information released about environmental samples taken from the market that were positive for the coronavirus do not resolve whether the source was animals sold there or people working or visiting the market, or both, he wrote.