By DONALD G. McNEIL Jr.
NYT Health
Only polio virus Type 1 persists, and only in Pakistan and Afghanistan. But now mutant vaccine viruses are paralyzing some unvaccinated children.
Published date: October 23, 2019 at 03:00AM
Wednesday, October 23, 2019
New Your Times - Health - Two Strains of Polio Are Gone, but the End of the Disease Is Still Far Off
By DONALD G. McNEIL Jr.
NYT Health
Only polio virus Type 1 persists, and only in Pakistan and Afghanistan. But now mutant vaccine viruses are paralyzing some unvaccinated children.
Published date: October 23, 2019 at 03:00AM
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