There is nothing new under the sun.

There's an interesting story about the Spanish Flu - mandatory vaccinations for soldiers at the end of world war I (not for the Spanish Flu, just general vaccinations), just before the outbreak. Spanish Flu impacted young, healthy men the most...precisely the population most likely to have been vaccinated. Numerous accounts written at the time said it was only the vaccinated dying. Mainstream sources don't mention it of course.