Lagos, Nigeria (PANA) - The number of wild poliovirus (WPV) cases in the World Health Organization (WHO) African Region dropped from 657 in 2010 to 350 in 2011, representing a 47% decline, according to the 2011 report on “Eradicating Polio in the African Region”, released on Wednesday in Brazzaville, Congo, by the WHO Regional Office for Africa.
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