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Pakistan has now reported 91 WPV1 cases this year, a sharp increase from 12 last year.
A WHO panel raises concerns about an increase in wild poliovirus cases, among other setbacks.
The study provides evidence that population immunity is critical for the successful phase-out of oral polio vaccines.
Babies living in countries affected by conflict made up more than half of the total of unvaccinated group.
High demand, production problems, and lack of raw materials contribute to the shortage, which has hindered immunization campaigns at a crucial time.
WHO Director-General Margaret Chan declared polio's spread this year to be a public health emergency, and she spelled out temporary steps for curbing the threat.
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