Nigeria

 

Status: has never stopped indigenous wild poliovirus (WPV) circulation

Nigeria is one of only three countries in the world with ongoing wild poliovirus transmission, alongside Afghanistan and Pakistan. The Global Polio Eradication Initiative is focusing on refining surveillance and closing immunity gaps, and maintaining political commitment, financial resources and technical support at all levels.

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.

Polio this week in Nigeria

  • No new cases of wild poliovirus type 1 (WPV1) were reported in the past week. The total number of WPV1 cases for 2016 remains four. The most recent case had onset of paralysis on 21 August in Monguno Local Government Area (LGA), Borno.
  • A circulating vaccine-derived poliovirus type 2 (cVDPV2) has been detected from Bodinga Local Government Area (LGA), Sokoto state. Two genetically-related viruses were isolated from an acute flaccid paralysis (AFP) case with onset of paralysis on 28 October 2016, and from a healthy community contact, collected on 24 November.
  • Following detection of the initial index case in October, a local immunization campaign conducted in the affected LGA and two wards of neighbouring LGAs with monovalent oral polio vaccine type 2 (mOPV2) were implemented on 3-6 December 2016, followed by a broader response on 16-19 December with other countries in the Lake Chad subregion. A third round synchronized mOPV2 vaccination campaign with neighbouring countries is planned for 28-31 January 2017.
  • These immunization activities are in response to both the cVDPV2 outbreak in Sokoto and an unrelated cVDPV2 detected in Borno state earlier this year, as well as to the WPV1 transmission affecting Borno.
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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

 

IHR Classification

Nigeria is classified by the International Health Regulations (IHR) as a state infected with wild poliovirus or circulating vaccine-derived poliovirus but not currently exporting and hence it is subject to temporary recommendations as of November 2016.

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