A Pakistani police officer, left, stands guard while health worker Shahida Akram, 41, prepares polio vaccines to be given for children in a neighborhood in Islamabad, Pakistan, Wednesday, Jan. 30, 2013. Some Islamic militants oppose the vaccination campaign, accuse health workers of acting as spies for the U.S. and claim the polio vaccine is intended to make Muslim children sterile. Pakistan is one of the few remaining places where polio is still rampant. (AP Photo/Muhammed Muheisen)

Associated Press
A Pakistani police officer, left, stands guard while health worker Shahida Akram, 41, prepares polio vaccines to be given for children in a neighborhood in Islamabad, Pakistan, Wednesday, Jan. 30, 2013.  Some Islamic militants oppose the vaccination campaign, accuse health workers of acting as spies for the U.S. and claim the polio vaccine is intended to make Muslim children sterile. Pakistan is one of the few remaining places where polio is still rampant. (AP Photo/Muhammed Muheisen)
A Pakistani police officer, left, stands guard while health worker Shahida Akram, 41, prepares polio vaccines to be given for children in a neighborhood in Islamabad, Pakistan, Wednesday, Jan. 30, 2013. Some Islamic militants oppose the vaccination campaign, accuse health workers of acting as spies for the U.S. and claim the polio vaccine is intended to make Muslim children sterile. Pakistan is one of the few remaining places where polio is still rampant. (AP Photo/Muhammed Muheisen)
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