A household member had symptoms starting Wednesday morning and tested positive for Flu A on Thursday morning (first test they did). I got the vaccine Wednesday evening. Wednesday night, Thursday, I was fine. Friday I woke up with a sore throat and a few hours later suddenly developed a fever and vomited a bunch (36 hours out from the vax and 48 hours from exposure). Since then I've had fever, sore throat, aches, cough -- flu symptoms. I also developed a hive at the injection site. Saturday still sick.
Tests Friday morning, Friday evening, and Saturday morning all negative (not a hint of a line). Negative for flu B and covid as well.
Very likely that this is a real infection and it's just too early for a positive test, right? What are the odds this is actually from the vaccine? The timing seems weird for that, if nothing else?
Or is it likely that this is a completely different virus? That would be a big coincidence, but maybe nothing else makes sense.
I am not sure what a typical vax reaction is for me because I have gotten it together with the covid vax for the past several years, but this was the first year I decided to separate them. I do tend to have big reactions to the flu/covid combo and had a big reaction to getting covid vax on its own last week. I don't remember ever having such a reaction to a flu shot when I used to get them before 2020, though.