Via the Very Short List, two public service ads from the last time the United States geared up to battle a feared swine flu epidemic:
The virus never became a killer, and vaccinations were halted two months after they began after reports that 500 people who received the shot developed a paralyzing nerve disease and more than 30 of them died.

Hey Eli, where were you three days ago:
http://slog.thestranger.com/slog/archive…
Blinded by Purell, apparently. Sorry for the days-later double post.
It’s also worth noting that the death rate from the side-effects was about 1 in one million, not exactly a high rate.
More people died from fire ants that year.