Monday, January 6, 2020

Two Strains of Polio Are Gone, but the End of the Disease Is Still Far Off by DONALD G. McNEIL Jr.


By DONALD G. McNEIL Jr.

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

Published: October 22, 2019 at 08:00PM

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