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by gus_massa
1186 days ago
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The injectable polio vaccine does not stop the transmission. It only make the virus not attack the nervous system, so you don't get paralysis. This is good, but it's impossible to erradÃcate polio with it. Once a country has no polio cases for a long enough time, they switch to only injectable version. More details in https://en.wikipedia.org/wiki/Polio_vaccine#Schedule |
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