Lab TheoryThe lack of a clear pathway from bats to humans has stoked speculation -- refuted by Daszak and many other scientists -- that the virus might have escaped from the Wuhan Institute of Virology, a maximum bio-containment laboratory studying bat-borne coronaviruses.Scientists visited the lab and asked Shi Zhengli, who has collected and analyzed these viruses for more than a decade, about the research and the earliest known coronavirus cases.‘Whole Gamut’“We really have to cover the whole gamut of key lines of investigation," Daszak said. “To be fair to our hosts here in China, they’ve been doing the same for the last few months.