Scientists in Wuhan working alongside the Chinese military were combining the world's most deadly coronaviruses to create a new mutant virus just as the pandemic began. Investigators who scrutinized top-secret intercepted communications and scientific research believe Chinese scientists were running a covert project of dangerous experiments, which caused a leak from the Wuhan Institute of Virology and started the Covid-19 outbreak. The US investigators say one of the reasons there is no published information on the work is because it was done in collaboration with researchers from the Chinese military, which was funding it and which, they say, was pursuing bioweapons. The investigators' report was published in early 2021. It made two assertions: that Wuhan scientists were conducting experiments on RaTG13 from the Mongolian mine, and that covert military research, including laboratory animal experiments, was being done at the institute before the pandemic. Dr Steven Quay, a US scientist who advised the State Department on its investigation ... believes Covid-19 was created by inserting a furn cleavage site into one of the mine viruses and then serial passaging it through humanized mice. He submitted a statement to the US Senate explaining the process. You infect the mice, wait a week or so, and then recover the virus from the sickest mice. Then you repeat. In a matter of weeks this directed evolution will produce a virus that can kill every humanized mouse."