December 14, 2021
IT'S A MYSTERY:
This chart show the history of three infectious diseases - smallpox, polio, and measles - before and after a vaccine was available.
— Max Roser (@MaxCRoser) December 13, 2021
From my @OurWorldInData post on humanity's long fight against infectious diseases https://t.co/t2fEYgnfjg pic.twitter.com/JzyYzmkxIb
Posted by Orrin Judd at December 14, 2021 12:00 AM