Different mutations and different variants. in china, where it has not been allowed to spread, are they seeing these variants or are they seeing a more original strain? the original strain is almost extinct. they are seeing different omicron subvariants, bf.7 which is a subtype of ba.5. china has not rolled out en masse any updated boosters, unlike the us and many european countries, although in the uk for example, they have been using ba.i bivalent which is also very outdated. so i think the issue is that the virus has mutated substantially and the vaccines currently are just not, the muscula...