Polio this week as of 25 April 2017
- The Strategic Advisory Group of Experts on immunization (SAGE) is meeting this week in Geneva, Switzerland. The group is expected to review the global polio eradication status and advise on additional measures that should be undertaken to fully implement the Polio Endgame Strategic Plan and secure a lasting polio-free world.
- The GPEI Secretariat Report to the upcoming World Health Assembly (WHA) has been finalized and is available here. The report summarises the current status against all four objectives of the Polio Endgame Plan, and will be the main tool to inform discussions by Member States at next month’s WHA.
- This week marks the World Immunization Week, aimed at raising global awareness of the need to ensure all children are vaccinated against polio and all vaccine-preventable diseases. The GPEI has launched two animations to help mark this special week, on the Polio Surveillance System and Reaching Every Last Child.
- Summary of newly-reported viruses this week: Afghanistan: two new wild poliovirus type 1 (WPV1) environmental positive samples; and, Pakistan: four new WPV1 environmental positive samples. See country sections below for further information.
NA: onset of paralysis in most recent case is prior to 2015. Figures exclude non-AFP sources. Lao PDR cVDPV1, all others cVDPV2. cVDPV definition: see document “Reporting and classification of vaccine-derived polioviruses” at [pdf]
Weekly country updates as of 25 April 2017
- No new wild poliovirus type 1 (WPV1) cases were reported in the past week. The total number of cases for 2017 remains three, and for 2016 remains 13. The most recent case had onset of paralysis on 21 February, from Kunduz province.
- Two new wild poliovirus type 1 (WPV1) environmental positive samples were reported in the past week, from Nangahar and Kandahar, collected on 25 March and 9 March, respectively.
- With most of Afghanistan polio-free, efforts are focused on continuing to strengthen operations, in close coordination with Pakistan, to address remaining low-level transmission in the common reservoir area of the Quetta-Kandahar corridor.
- No new wild poliovirus type 1 (WPV1) cases were reported in the past week. The total number of WPV1 cases for 2017 remains two, and for 2016 remains 20. The most recent case had onset of paralysis on 13 February, from Diamir district, Gilgit Baltistan.
- No new WPV1 positive environmental samples were reported in the past week.
- The year 2016 saw the lowest ever annual number of polio cases in the country but poliovirus continues to be isolated through environmental surveillance over a significant geographical range. Efforts are ongoing through implementation of the national emergency action plan to address remaining gaps in coverage and surveillance, in close coordination with neighbouring Afghanistan.
- 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 and no cases have been reported in 2017. The most recent case had onset of paralysis on 21 August in Monguno Local Government Area (LGA), Borno.
- Nigeria continues to implement emergency outbreak response to the detected WPV1 strain and circulating vaccine-derived poliovirus type 2 (cVDPV2) strains affecting the country.
- The response is part of a broader regional outbreak response, coordinated with neighbouring countries, in particular the Lake Chad sub-region, including northern Cameroon, parts of Central African Republic, Chad and southern Niger.
- Detection of polio cases underscores the risk posed by low-level undetected transmission and the urgent need to strengthen subnational surveillance.
- The detection of wild poliovirus type 1 (WPV1) and circulating vaccine-derived poliovirus type 2 (cVDPV2) in Nigeria poses a risk to the neighbouring countries of the Lake Chad basin and hence an outbreak response plan is being implemented as part of the response to the Nigeria outbreak.
- Emergency outbreak response efforts continue across the Lake Chad basin, together with activities to fill subnational surveillance gaps across the region.