A member asked:

Why cases of polio do occur in children despite giving the oral polio vaccine(opv)?

A doctor has provided 1 answer

Vaccine-related: The reason that the usa switched back to the killed polio vaccine is that, by then, there was no wild-type polio in the country but a handful of cases occurred related to the live, attenuated oral vaccine.

Answered 6/29/2014

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