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.  Additionally, parts of West Africa (Guinea), are affected by an ongoing outbreak of circulating vaccine-derived poliovirus type 2 (cVDPV2).

Liberia’s vaccination coverage has declined significantly since the Ebola outbreak, with as many as 50% of children being un- or under-immunized.  This means they are particularly vulnerable to diseases such as polio. Efforts are underway to strengthen both immunity levels and disease surveillance, to minimise 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.