Discover and read the best of Twitter Threads about #PolioVaccines
Most recents (1)
1/ Going to slowly do a set of threads on the history of #polio itself, & then on the #PolioVaccines. This is for various concepts, including endemicity, epidemicity, risk calculation, & so on. Polio is an ancient disease. Here's a 3,400-year-old depiction thought to be b/c polio 
2/ The first really important point is that polio has been around as long as humans have written, and it has been *everywhere* where humans are, in the New World AND the Old World before the Columbian Exchange, *everywhere* with humans.
3/ The next really important point is that polio epidemics — waves — were practically unknown before the 20th century. Yet polio itself was known & described before the 20th century. So what happened, why the big change? Why epidemicity, rather than... endemicity?
