Couldn’t find the actual number for the height, but the fact that somehow polio was harmless, or didn’t provoke symptoms in the majority of those infected is a problem, given that parents who have vulnerable children were playing Russian Roulette with what the virus could do. Polio is a problem given that the majority infected are asymptomatic carriers of the virus. However, comparing polio to measles, well, measles is a lot less terrible. Like I often say, the flu makes a lot of diseases look pretty weak and tame, even nowadays.