Deutsche Welle: WHO launches worldwide effort to completely eliminate polio
“More than 150 countries and territories launched a new effort on Sunday that health experts hope will lead to the complete eradication of the polio virus within the next year or two…” (4/17).

NPR: New Polio Vaccine Rolled Out In Massive Synchronized Worldwide Switch
“…The shift, which is expected to be completed by May 1, is the ‘largest and fastest globally coordinated rollout of a vaccine into routine immunization programs in history,’ according to the Global Polio Eradication Initiative…” (Kennedy, 4/17).

STAT: ‘We have never been this close’: The campaign to eradicate polio takes a giant step forward
“…So between this past Sunday and May 1, all countries that use the oral polio vaccine developed more than 60 years ago must stop administering the current formula and replace it with a new version…” (Branswell, 4/18).