My guess: there is no 'virus' no such thing. You can cause a virus like reaction by engaging the immune system with various assaults on the body. Re China, I read this recently.. not sure how contagious biological agents work.. but sounds interesting.. And aligns with another source saying covid was supposed to be much more devastating.. but many are talking about the lack of isolation etc so seems there's a lot of BS with the whole thing.. Including PCR which Kerry Mullis got the Nobel prize for, and said it is not to be used for 'viruses'...