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

In this file photo from April 9, 2018, a boy receives polio vaccine drops during an anti-polio campaign in a low-income neighborhood in Karachi. (Reuters)

Updated 24 October 2019

The New York Times

October 24, 2019 10:04

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

Updated 24 October 2019

The New York Times

October 24, 2019 10:04

October 23: Only poliovirus Type 1 persists, and only in Pakistan and Afghanistan. But now mutant vaccine viruses are paralyzing some unvaccinated children.