The deniers all need to be strapped to a chair, have their eyelids taped open and made to watch "Influenza 1918 " on PBS.
Herd immunity? easy to obtain. Let the virus kill off everyone who is NOT resistant . Presto, everyone left is resistant/immune (maybe). Might take 40 or 50 million early deaths, no problem.
Vaccine? They had none in 1918-1919. The two or three global sweeps of the viral epidemic (when did the term "Pandemic" come into use?) took care of that. See previous sentence.
Maybe the Hong Kong or Swine Flu. Does the conquering of Polio count? There wer