Overview
Chad is experiencing outbreaks of both wild poliovirus type 1 (WPV1) and wild poliovirus type 3 (WPV3). The WPV3 outbreak has been ongoing since November 2007, while the WPV1 outbreak began in September 2010 as a result of a new importation virus from northern Nigeria. Originally restricted to the greater N'Djamena area, the WPV1 outbreak has been intensifying in 2011, spreading to other areas of the country. So far, outbreak response vaccination activities have been inadequate to stop transmission.(WHO, 10 Jun 2011)












