people couldn't really speak out in any kind of support of that view or elements of that view because of being aligned with his ideology. i'm professor devi sridhar at the university of edinburgh medical school. looking at the pieces of evidence we have already in trying to connect the dots, it looks like it was not bioengineered. it was a natural origin but it could have happened through a laboratory accident, a laboratory leak, as you say, because when it emerged so close to the wuhan institute of virology, which is a level four laboratory, the highest level of experiments with dangerous viruses to humans, and also because we have not had a full audit in transparency from the chinese government, nor found an intermediary animal host that would explain the virus's spill—over. questions have also been raised