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I was alluding to how easily polio is transferred, saying that it's NOT. I'm sure out of the hundreds of thousands NOT vaccinated, some have encountered polio, however it's not as easily to create a problem as 7437 was alluding to with the comment "Everyone gets polio in the infected areas" and his "SUPER contagious" comment.
I think one of the big fears with polio with regard to vaccination rates is that polio itself is fairly contagious, while cases of paralytic polio are relatively rare, and many cases are asymptomatic. A soldier returning from pakistan could start a chain that can travel quite far before paralytic polio cases start to emerge.