Status: no longer poliovirus-infected, but at high risk of outbreaks

West Africa remains at particular risk of poliovirus. Detection of wild poliovirus type 1 (WPV1) in 2016 in north-eastern Nigeria means the entire region is currently at risk. Liberia has subnational vaccination coverage gaps. This means that children are particularly vulnerable to diseases such as polio. Efforts are underway to strengthen both immunity levels and disease surveillance, to minimize the risk and consequences of a potential re-infection or re-emergence of poliovirus.

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Key at-risk: no longer poliovirus-infected, but at high risk of outbreaks
Outbreak: has stopped indigenous WPV circulation but affected by outbreak of imported WPV or circulating vaccine-derived poliovirus
Endemic: has never stopped indigenous wild poliovirus (WPV) circulation

Travel advice

WHO’s International Travel and Health recommends that all travellers to polio-affected areas be fully vaccinated against polio. Residents (and visitors for more than 4 weeks) from infected areas should receive an additional dose of OPV or inactivated polio vaccine (IPV) within 4 weeks to 12 months of travel.