I forget his name, but some frog nobel prize winner explained that covid was created in a lab, and like most viruses put together by humans, they break down when reproducing. There probably was a dangerous virus released in china, but whatever remnants made it out of the country would be weak, and not of much concern. Hence why you needed PCR tests to get any positive results. PCR can detect anything, in anyone, if you cycle the test material enough times.