WHO confirms polio type 2 outbreak closures in 5 African nations; Nigeria wild polio-free for 6 years
WHO confirmed Wednesday that poliovirus type 2 outbreaks are closed in Burundi, Ghana, Guinea-Bissau, Republic of Congo and Uganda after assessments January-June 2026 showed interrupted transmission through targeted vaccination, investigations and environmental surveillance. Nigeria has maintained zero wild poliovirus transmission for six years but continues responding to circulating vaccine-derived poliovirus type 2 (cVDPV2), with the National Polio Laboratory in Ibadan analyzing over 23,000 stool samples yearly from 26 states and FCT plus 60 wastewater sites.
While celebrating this regional milestone, WHO Regional Director Mohamed Janabi warned that outbreak closure doesn't eliminate reimportation risks, citing Madagascar's recent poliovirus detection after declaring its outbreak closed. He stressed continued vigilance, strong surveillance and high immunization coverage remain essential to protect children and prevent future outbreaks across Africa.
For Nigerians, this progress shows regional eradication efforts work while highlighting why Nigeria must sustain its polio defenses despite being wild polio-free. The country's cVDPV2 response relies on lab capacity in Ibadan and nationwide surveillance networks that process thousands of samples annually to catch any resurgence early.
What specific surveillance improvements should Nigeria prioritize now to maintain its polio-free status amid persistent cVDPV2 threats and regional reimportation risks like Madagascar's case?