The WHO on Tuesday announced a mass polio immunization campaign in 15 African countries targeting a total of 72 million children, Agence France-Presse reports. "Polio has spread again in recent years with cases imported from some of the four endemic nations in Asia and Africa, mainly Nigeria, in a setback to global attempts to eradicate the crippling and sometimes lethal disease," the news service writes (10/26)... 
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