Epidemiological Alert: Poliomyelitis due to wild poliovirus 22 September 2011

As of the 21st of September 2011, the Global Polio Eradication Initiative had reported 401 cases of poliomyelitis caused by wild poliovirus; 147 were registered in endemic countries1 and 254 in non-endemic countries. Of the total registered cases, 343 were due to wild poliovirus type 1 (WPV1) and 58 to wild virus type 3 (WPV3). The Region of the Americas has remained free of the circulation of wild poliovirus since 1991.