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FILE -- In this Jan. 25 , 2002 file photo, a Congolese child is given a polio vaccination at a relief camp near Gisenyi, Rwanda. A report issued Friday Nov. 22, 2019, the World Health Organization said four African countries have reported more new cases of polio linked to the oral vaccine, than cases of polio contracted in the wild. (AP Photo/Karel Prinsloo, File)
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