This Week

Polio this week as of 22 November 2017

  • Summary of newly-reported viruses this week: Afghanistan: Four new wild poliovirus type 1 (WPV1) positive environmental samples, three collected from Kandahar province, and one from Kabul province. Pakistan: One new WPV1 positive environmental sample, collected from Sindh province. Syria: Seven new circulating vaccine derived poliovirus type 2 (cVDPV2) cases reported, all from Deir Ez-Zor governorate.
  • See country-specific sections for further details.

NA: onset of paralysis in most recent case is prior to 2016. 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 22 November 2017

  • Four new wild poliovirus type 1 (WPV1) positive environmental samples have been reported. Three samples were collected in Kandahar district, Kandahar province, and one sample was collected in Kabul district, Kabul province.
  • No new WPV1 cases were reported this week. The total number of officially reported WPV1 cases in Afghanistan in 2017 remains ten.
  • Read the latest polio update from Afghanistan to see information on cases, surveillance and vaccination campaigns.
  • One new wild poliovirus 1 (WPV1) positive environmental sample was reported in the last week. The sample was collected in Karachi district, Sindh province.
  • No new WPV1 cases have been reported. The total number of WPV1 cases in 2017 in Pakistan remains five.
  • A round of National Immunization Days (NIDs) are ongoing this week, aiming to reach about 37 million children aged less than five years across the country.
  • Read the latest polio update from Pakistan to see information on cases, surveillance and vaccination campaigns.
  • 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 2016 in Monguno Local Government Area, Borno.
  • Nigeria continues to implement an emergency response to the detected WPV1 strain and circulating vaccine-derived poliovirus type 2 (cVDPV2) strains affecting the country (last detected in 2016).
  • Following the recently completed Outbreak Response Assessment (OBRA) in the country, the OBRA team continues to develop a detailed report of the findings. This will be submitted to the Government of Nigeria and partners, and will help inform a new plan of action for polio outbreak response in the coming months.
  • Detection of polio cases in Nigeria underscores the risk posed by low-level undetected transmission. As part of the emergency response, subnational surveillance continues to be strengthened.
  • The detection of wild poliovirus type 1 (WPV1) (Borno state, Nigeria in 2016) and circulating vaccine-derived poliovirus type 2 (cVDPV2) (Borno and Sokoto states in 2016) continue to pose a risk to the neighbouring countries of the Lake Chad basin.
  •  Emergency outbreak response efforts continue across the Lake Chad basin, together with activities to fill subnational surveillance gaps across the region.
  •  These activities include efforts to vaccinate children at markets, in internally displaced persons camps, and at international borders.
  •  Following the recent Outbreak Response Assessments (OBRAs) undertaken in Lake Chad region countries, reports are being compiled that will help inform polio outbreak response over the coming months.
  • Read the latest polio update from the Lake Chad Basin to see information on cases, surveillance and vaccination campaigns.
  • No new cases of type 2 circulating vaccine-derived poliovirus (cVDPV2) were reported this week in the Democratic Republic of the Congo (DR Congo). The total number of cVDPV2 cases this year is ten.
  • Most cases this year are linked to an outbreak in Haut Lomami province, where the onset of paralysis of the most recent case was 27 July.
  • A separate outbreak occurred in Maniema province earlier this year, consisting of two cases with onset of paralysis on 26 March and 18 April, with an additional isolate detected in a healthy individual with sample collection on 2 May.
  • Outbreak response continues to take place across the country, including use of monovalent oral polio vaccine type 2 (mOPV2) in line with internationally-agreed outbreak response protocols.
  • Surveillance and immunization activities continue to be strengthened in neighbouring countries.
  • Seven new circulating vaccine derived poliovirus type 2 (cVDPV2) cases reported, four from Mayadeen and three from Boukamal districts, Deir Ez-Zor governorate. The total number of cVDPV2 cases is now 70. The most recent confirmed case by date of paralysis onset is 9 September 2017.
  • Outbreak response teams are planning a third mass immunization round to reach children aged less than five years with monovalent oral polio vaccine 2 (mOPV2) in areas where evidence of virus transmission continues.
  • A request from the Syrian Ministry of Health for up to one million doses of mOPV2 and 500,000 inactivated polio vaccine (IPV) doses is being processed to ensure readiness for the second phase of the outbreak response.
  • Sub-National Immunization Days (SNIDs) aiming to reach children aged less than five years with bOPV started this week in areas of Rural Damascus, districts of Damascus, Homs, Aleppo and accessible areas of Deir Ez-Zor city. Children aged 2-23 months will also be reached with supplementary IPV during the sub-national campaign, particularly in areas with large IDP populations.
  • Work continues to support the upgrade of laboratory facilities to enable more sophisticated techniques to be conducted in-country for the detection of poliovirus and the establishment of environmental surveillance.
  • Read the latest polio update from Syria to see information on cases, surveillance and vaccination campaigns.