The great flu epidemic of 1918 kills…
1918 CE
The great flu epidemic of 1918 kills 20 million people over the world.
The epidemic may have been caused by a type A virus, possibly the swine flu virus.
Some attribute the epidemic to widespread use of vaccines; a minority opinion connects it to wartime use of poison gases.
Others have the raised the possibility of Reyes Syndrome, as aspirin was heavily prescribed for the first time.