TABLE OF CONTENT - WHO | World Health Organization

For the first time in the history of the GPEI, in 2013 all cases caused by a wild virus were due to a single serotype, type 1 (Figure 1). The most recent WPV3 case dates to November 2012, from Nigeria. Cases due to circulating vaccine-derived poliovirus type 2 declined by 10% compared to 2012. ................
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