Undone
All-American
Ugh. Year to year-and-a-half.
And I just want to put this out there for those who haven't ever studied this (and that is probably not you, knapp): The CDC reports flu vaccine efficacy rates of roughly 50%. About four years ago it was actually south of 30% because the right strain wasn't taken into wide enough account that year.
This means that for people who got the flu vaccine and then also contracted the flu, 50% or greater did wind up "getting the flu" (showed flu symptoms).
We don't know yet exactly how many COVID strains there are yet. About a month ago I read a report of a study that indicates there are already over 40. Again: This is a novel virus. There is so much we don't know yet.