Two Strains of Polio Are Gone, but the End of the Disease Is Still Far Off

Only polio virus Type 1 persists, and only in Pakistan and Afghanistan. But now mutant vaccine viruses are paralyzing some unvaccinated children.
By BY DONALD G. MCNEIL JR. from NYT Health https://ift.tt/2p9ZHJt
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Poliomyelitis, Vaccination and Immunization, Viruses, Paralysis, Epidemics, Muslims and Islam
Source New York Times
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