** FILE ** In this file photo dated Monday Nov. 25, 2013, a Pakistani child is vaccinated against polio by a health worker in Islamabad, Pakistan, Monday, Nov. 25, 2013. (AP Photo/Muhammed Muheisen, FILE)
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** FILE ** In this file photo dated Monday Nov. 25, 2013, a Pakistani child is vaccinated against polio by a health worker in Islamabad, Pakistan, Monday, Nov. 25, 2013. (AP Photo/Muhammed Muheisen, FILE)
