bug now. The disease changed, the vaccine has not (yet). We are fortunate it still helps prevent serious illness.

Interesting where this goes from here. One of the reasons we don’t have a vaccine for the cold virus is that many of those virus’s mutate too fast to make it worthwhile. The flu also mutates, slow enough that a yearly shot often helps. Although often only around 50% effectiveness.

So it could land in the “not worth it at all” going forward. Or a yearly Covid shot may become the norm. Who knows. I think it will continue to mutate into less virulent forms.