Photo - A Pakistani female polio worker administers polio drops to an infant in Christian colony situated in the slums of Islamabad, Pakistan on  Wednesday, Dec. 19, 2012 in Islamabad, Pakistan. Gunmen shot dead a woman working on U.N.-backed polio vaccination efforts and her driver in northwestern Pakistan, officials said, just a day after similar attacks across the country killed several female polio workers. (AP Photo/B.K. Bangash)
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