I'm late to the flu shot controversy...but don't the "experts" pretty much admit that the vaccine is brewed from the previous year's flu du jour and thusly 50% effective at most? I think last year, pre-covid, they admitted it was 38% effective.
Jeez, hand washing is probably 50% effective.
As I understand it, they look around the world (for us that's primarily the Southern Hemisphere's winter) to see what strain is floating around. Sometimes it mutates before it get to us and sometimes we just get a different strain. Even if they guess wrong and it's not 100% effective, chances are it will provide some level of protection and if you get the flu, it may not be as serious as it otherwise would have been. They obviously have to produce the vaccine before the flu season, so there is some guesswork involved.
