This Week

Polio this week as of 18 September 2019

  • In the Philippines, a case of vaccine-derived poliovirus has been detected and is being further investigated, as outbreak response will be implemented.  See ‘Philippines’ section below for further details.
  • Summary of new viruses this week: Afghanistan — six wild poliovirus type 1 (WPV1)- positive environmental samples; Nigeria— one circulating vaccine-derived poliovirus type 2 (cVDPV2) case; Angola— seven cVDPV2 cases

See country sections below for more details.

NA: Onset of paralysis in most recent case is prior to 2017. Figures exclude non-AFP sources. In 2018, cVDPV includes all three serotypes 1, 2 and 3.
For Somalia: 1 cVDPV2 and cVDPV3 isolated from one AFP case.
cVDPV definition: see document “Reporting and classification of vaccine-derived polioviruses” at [pdf].

Weekly country updates as of 18 September 2019

  • No wild poliovirus type 1 (WPV1) case was reported. There are 16 WPV1 cases reported in 2019. There were 21 WPV1 cases reported in 2018.
  • Six WPV1-positive environmental samples were reported in the past week: four from Kandahar, Kandahar province; one from Jalalabad district, Nangarhar province; and, one from Nahr-e-Saraj, Hilmand province. The samples were collected between 26-27 August 2019.
  • Read the latest polio update from Afghanistan to see information on cases, surveillance and vaccination campaigns.
  • No wild poliovirus type 1 (WPV1) case was reported. There are 62 WPV1 cases reported in 2019. There were 12 WPV1 cases reported in 2018.
  • No WPV1-positive environmental sample was reported.
  • Read the latest polio update from Pakistan to see information on cases, surveillance and vaccination campaigns.
  • One case of circulating vaccine-derived poliovirus type 2 (cVDPV2) was reported this week from Ibaji district, Koji province with onset of paralysis on 08 August 2019. There are 16 cVDPV2 cases reported in 2019. There were 34 cVDPV2 cases in 2018.
  • Read our Nigeria country page to see information on surveillance and vaccination campaigns.
  • No case of circulating vaccine-derived poliovirus type 2 (cVDPV2) was reported this week.
  • In the Lake Chad region, cVDPV2 linked to the outbreak originating in Nigeria has been detected in Niger (one case in 2019 and ten cases in 2018), and Cameroon (one positive environmental sample, collected on 20 April 2019 in Extreme Nord).
  • The risk of further cVDPV2 spread across the Lake Chad subregion remains high.
  • Read our Niger country page to see information on surveillance and vaccination campaigns.
  • No case of cVDPV2 was reported this week. There is one cVDPV2 case in 2019.
  • The risk of further cVDPV2 spread across West Africa remains high.
  • Read our Benin country page to see information on surveillance and vaccination campaigns.
  • No case of cVDPV2 was reported this week. There has been one cVDPV2 case in 2019.
  • Surveillance is being strengthened in neighbouring Togo, Côte d’Ivoire and Burkina Faso.
  • The risk of further cVDPV2 spread across West Africa remains high.
  • Read our Ghana country page to see information on surveillance and vaccination campaigns.
  • Seven cases of circulating vaccine-derived poliovirus type 2 (cVDPV2) were reported this week: one from Chitato district, Lunda Norte province; three from Tchikala-Tcholhan district and one from Katchiungo district, Huambo province; one from Cuemba district, Bie province; and, one from Belas, Luanda province. The onsets of paralysis were between 07 June and 14 August 2019. There is a total of 15 cVDPV2 cases from five outbreaks reported in 2019.
  • Learn more about vaccine-derived polioviruses through this short animation or this ‘Coffee with Polio Experts’ video.
  • Read our Angola country page for more information
  • No case of cVDPV2 was reported this week. There are six reported cases in 2019 from five different outbreaks of cVDPV2 in 2019. Additional confirmed cVDPV2 community contact have been reported in CAR.
  • Two cVDPV2-positive environmental samples were reported from Région sanitaire 7, both collected on 22 August 2019.
  • Read our Central African Republic country page for more information.
  • No case of circulating vaccine-derived poliovirus type 2 (cVDPV2) was reported this week. There have been two cVDPV2 cases reported in 2019.
  • Somalia has reported a total of 15 cVDPV cases (eight type 2, six type 3 and one coinfection of both type 2 and type 3) since the beginning of the outbreaks.  The most recent cVDPV3 virus was from an AFP case from Runingod district, Middle Shabelle province with an onset date of paralysis on 7 September 2018.  Circulating VDPV2 has also been detected during 2018 in one environmental sample in Kenya collected on 21 March 2018.There are also two reported cases of cVDPV2 in Ethiopia, linked to Somalia in 2019.
  • Learn more about vaccine-derived polioviruses through this short animation or this ‘Coffee with Polio Experts’ video.
  • No case of circulating vaccine-derived poliovirus type 2 (cVDPV2) outbreak has been reported this week.  There was one case reported in 2018.
  • Learn more about vaccine-derived polioviruses through this short animation or this ‘Coffee with Polio Experts’ video
  • Read our Mozambique country page to see information on cases, surveillance and response to the developing outbreak.
  • No circulating vaccine-derived poliovirus type 1 (cVDPV1) cases were reported this week.  One cVDPV1 case was reported in 2018 from Papua province with onset of paralysis on 28 November 2018.
  • This outbreak is not linked to the cVDPV1 in neighbouring Papua New Guinea.
  • Learn more about Indonesia polio outbreak response through weekly situational report
  • No new WPV1-positive environmental samples were reported this week.  In total, three WPV1-positive environmental samples have been reported in 2019, all from Sistan and Balochistan province.  The isolated viruses have been detected in environmental samples only, and genetic sequencing confirms they are linked to WPV1 circulating in Karachi, Pakistan.
  • Read our Iran country page to see information on surveillance and latest travel advisory.
  • No cVDPV2 case was reported in the past week.  The total number of cVDPV2 cases in the country remains one.
  • Learn more about vaccine-derived polioviruses through this short animation or this ‘Coffee with Polio Experts’ video.
  • Read our China country page to see information on cases, surveillance and response to the developing outbreak.
  • No case of circulating vaccine-derived poliovirus type 1 (cVDPV1) was reported this week. There are four reported cases of cVDPV1 in 2019.
  • Learn more about vaccine-derived polioviruses through this short animation or this ‘Coffee with Polio Experts’ video.
  • Read our Myanmar country page to see information on cases, surveillance and response to the developing outbreak.
  • One case of vaccine-derived poliovirus type 2 (VPDV2) was reported in the province of Lanao Del Sur, Mindanao, with an onset date of paralysis on 26 June 2019. The Department of Health and local government units, with support from the World Health Organization (WHO) and UNICEF, are currently investigating the case.
  • Read our Philippines country page to see information on cases, surveillance and response to the developing situation.