South Sudan

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

South Sudan has not reported a case of wild poliovirus since 2009. However it is still considered at risk of polio due to sub-national surveillance and immunization gaps, insecurity and population movements. The Horn of Africa has a long history of outbreaks of polio due to large pockets of children remaining unimmunized, weak surveillance systems in some areas that fail to recognise importations before they take hold, mobile populations that are hard to access, and conflict and insecurity that create inaccessible zones. To ensure that the country stays free from polio, it is essential for momentum to be maintained to reach every child with polio vaccines and to strengthen disease surveillance.

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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.