Influenza
- There are no known serious side effects in regard to Influenza vaccination which can be linked to the vaccine itself
In patients with H[eart]F[ailure], influenza vaccination was associated with a reduced risk of both all-cause and cardiovascular death after extensive adjustment for confounders. Frequent vaccination and vaccination earlier in the year were associated with larger reductions in the risk of death compared with intermittent and late vaccination.
SCNR, you didn’t specify adverse side effects. :P
Not what OP said over on the (now deleted) Reddit post: