--I am a little worried, given my acute onset history.

That is not to say I am anti-all vaccines; I do get my boosters. Last year I got a tetanus booster with no problems.

I am fortunate that I seem to have considerable resistance to influenza strains--in my tutoring work each year I'm sure I am exposed fairly often, but do not seem to have gotten the flu in many decades. (Or maybe I'm just fortunate with the hand-washing.)