maybe someone can correct me, but AFAIK, BSL4 is required for handling SARS-related coronavirus samples, at least in the US. this would make the distinction bet

maybe someone can correct me, but AFAIK, BSL4 is required for handling SARS-related coronavirus samples, at least in the US. this would make the distinction between BSL3 and BSL4 pretty significant. while there probably are BSL3 labs in most major cities in the world, there are only two BSL4 facilities in china and WIV is one of them.