Wild poliovirus in Cameroon
Wild poliovirus type 1 (WPV1) has been confirmed in Cameroon, the first wild poliovirus in the country since 2009.
Wild poliovirus was isolated from two acute flaccid paralysis (AFP) cases from West Region. The patients developed paralysis on 1 October and 19 October 2013. Genetic sequencing indicates that these viruses are linked to wild poliovirus last detected in Chad in 2011.
An emergency outbreak response plan is being finalized, including at least three national immunization days (NIDs), the first of which was conducted on 25-27 October 2013. Subnational immunization days (SNIDs) will be implemented in December 2013, followed by two subsequent national immunization days in January and February 2014. Routine immunization rates are reported to be approximately 85.3 percent for oral polio vaccine (OPV3). A response in neighbouring countries is also being planned, notably in Chad and Central African Republic.
Considering that this strain was last detected in the region in 2011, plans are also being developed to strengthen surveillance activities starting with a detailed analysis of sub-national surveillance sensitivity across the region to more clearly ascertain any gaps.