The US (America is a continent), or rather its government, is doing its damnedest to say nothing about the origins of SARS-CoV-2, ‘cos it was a US sponsored agency that commissioned the Wuhan work. The WHO has been falling over itself to cooperate with the Chinese government because it would do no good at all for anyone to antagonise them; what cooperation they have would be withdrawn.
Research into a lab leak needs to be negotiated at the political / legal level before it can proceed unrestricted. The Wuhan researchers are probably bound by US civil non-disclosure agreements in their contracts, as well as the Chinese government’s restrictions.
https://thebulletin.org/2021/05/the-origin-of-covid-did-people-or-nature-open-pandoras-box-at-wuhan/
– The US government shares a strange common interest with the Chinese authorities: Neither is keen on drawing attention to the fact that Shi’s coronavirus work was funded by the US National Institutes of Health. One can imagine the behind-the-scenes conversation in which the Chinese government says, “If this research was so dangerous, why did you fund it, and on our territory too?” To which the US side might reply, “Looks like it was you who let it escape. But do we really need to have this discussion in public?”