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The study supports WHO guidance for conserving vaccine during shortages.
A WHO panel raises concerns about an increase in wild poliovirus cases, among other setbacks.
CDC director promises "full capacity" of science to address the paralyzing condition.
So far 62 acute flaccid myelitis cases—marked by sudden limb weakness—have been confirmed.
The study provides evidence that population immunity is critical for the successful phase-out of oral polio vaccines.
In 2017, the number of global wild poliovirus cases sank to its lowest level, WHO and CDC researchers say.
Babies living in countries affected by conflict made up more than half of the total of unvaccinated group.
A second case of vaccine-derived polio is reported in Raqqa, Syria, while a Pakistani toddler has a wild poliovirus infection.
The new vaccine-derived cases lift the outbreak total to 22, all but 1 in Deir ez-Zor governorate.
The WHO says the 2 vaccine-derived clusters in the DRC involve 2 separate strains.
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