NPR News: Mutant Strains Of Polio Vaccine Now Cause More Paralysis Than Wild Polio

Mutant Strains Of Polio Vaccine Now Cause More Paralysis Than Wild Polio
So far this year, there have been only six cases of wild polio — and 21 cases of vaccine-derived polio, most of them in Syria.

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June 29, 2017 at 02:22AM
Children's Health