In this photo taken on Saturday, August 28, 2016, a child cries after she was administered with a polio vaccine during a house to house vaccination exercise in Maiduguri, Nigeria. An emergency polio vaccination campaign aimed at reaching 25 million children this year has begun in parts of Nigeria newly freed from Boko Haram Islamic extremists, with fears that many more cases of the crippling disease are likely to be found. (Photo by Sunday Alamba/AP Photo)
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