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

The New York Times
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)

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

Read More