Chad experienced outbreaks of both wild poliovirus type 1 (WPV1) and wild poliovirus type 3 (WPV3). The WPV3 outbreak started in 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 intensified in 2011, spreading to other areas of the country. (WHO, 10 Jun 2011)
The last case of polio was recorded on 14 Jun 2012 (OCHA, 30 Jun 2013).