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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.
Read more on NPR
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.
Read more on NPR
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