Lest we forget:
https://www.bbc.com/future/article/20200918-the-fiasco-of-the-us-swine-flu-affair-of-1976
Come to think of it, one of my grandfathers had to have a blood clot removed from his carotid artery that almost killed him back in the 1950's or '60's. When did the influenza vaccine become prevalent, again…?