Two Strains of Polio Are Gone, but the End of the Disease Is Still Far Off by BY DONALD G. MCNEIL JR.

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Only polio virus Type 1 persists, and only in Pakistan and Afghanistan. But now mutant vaccine viruses are paralyzing some unvaccinated children.

Published: October 24, 2019 at 12:00AM

from NYT Health https://ift.tt/2p9ZHJt