Polio this week

Headlines

  • In December 2023, novel oral polio vaccine type 2 (nOPV2) made history by becoming the first vaccine to move from use under a WHO Emergency Use Listing (EUL) recommendation to full licensure and WHO prequalification. We catch up with Chair of the GPEI’s nOPV Working Group Dr. Ananda S. Bandyopadhyay, from the Bill & Melinda Gates Foundation, the Chair of GPEI’s Vaccine Supply Group Ann Ottosen, from UNICEF’s Supply Division, and WHO African Region’s Polio Eradication Coordinator Jamal Ahmad to discuss how things have changed in terms of nOPV2’s use, and next steps for this innovative tool. Read more

Summary of new polioviruses this week, cases and positive environmental isolates:

  • Pakistan: two WPV1-positive environmental samples
  • DR Congo: one cVDPV2-positive environmental sample
  • Egypt:  one cVDPV2-positive environmental sample
  • Guinea:  four cVDPV2 cases and three positive environmental samples

Country updates as of 21 February 2024

  • No WPV1 cases were reported this week. The total number of cases in 2023 remains six.
  • No WPV1-positive environmental samples were reported this week.
  • No WPV1 viruses were reported this week.  The total number of WPV1 cases in 2023 remains six.
  • Two WPV1-positive environmental samples were reported; one each in Balochistan and Khyber Pakhtunkhwa.
  • No cVDPV2 cases were reported this week. There were three cases reported in 2022.
  • No cVDPV2 cases have been reported since February 2020.
  • No cVDPV2-positive environmental sample was reported this week.
  • No cVDPV2 cases were reported this week. There are 3 cases reported in 2023.
  • No cVDPV2-positive environmental sample was reported this week.
  • No cVDPV2 positive environmental samples were reported this week.
  • No cVDPV2 cases were reported this week. There have been two cases reported in 2023.
  • No cVDPV2 cases were reported this week. There was one case reported in 2023 and one in 2022.
  • No cVDPV2 cases were reported this week. There were three cases reported in 2022.
  • No cVDPV2-positive environmental samples were reported this week.
  • In August 2022, cVDPV2 was isolated from two environmental samples from a large wastewater treatment plant and a target site in the city of Montreal, Quebec. This was after the country conducted retrospective analysis of wastewater samples. Genetic sequencing confirmed linkage to the cVDPV2 case from New York, USA.
  • No cVDPV2 cases were reported this week. There have been 14 cases reported in 2023 and six cases in 2022.
  • No cVDPV2 cases were reported this week.  The total number of cases in 2023 remains 54.
  • No cVDPV2-positive environmental samples were reported this week.
  • No cVDPV2 case was reported this week. The number of 2023 cases remain 6.
  • There are no polio cases reported in the country.
  • No cVDPV2-positive environmental samples were reported this week.  
  • No cVDPV1 cases were reported this week. The number of 2023 cases remains 105.
  • No cVDPV2 cases were reported this week. The number of 2023 cases remains 118.
  • One cVDPV2-positive environmental sample was reported in Kinshasa.
  • There are no polio cases reported in the country.
  • One cVDPV2-positive environmental sample was reported in Cairo.
  • No cVDPV2 cases were reported this week. There was one case reported in 2022.
  • No cVDPV2 case was reported this week. There was one case reported in 2022.
  • No cVDPV2 case was reported this week. There were three cases reported in 2022.
  • Four cVDPV2 cases were reported; one each in Kankan, Nzerekore, Kindia and Faranah bringing the number of 2023 cases to 46.
  • Three cVDPV2-positive environmental samples were reported in Conakry.
  • No cVDPV2 cases were reported this week. The total number of 2023 cases remain 6.
  • No cVDPV2-positive environmental sample was reported this week.
  • No cVDPV2 cases were reported this week. There has been one cVDPV2 case reported last year.
  • No cVDPV2 cases were reported this week. There have been eight cases reported last year.
  • No cVDPV2-positive environmental samples were reported this week.
  • No virus was reported this week.  The total number of cVDPV1 cases for 2023 remains 24.
  • No cVDPV1 cases were reported this week. There were four cases reported in the country in 2022.
  • No WPV1 cases were reported in 2023.
  • No virus was reported this week.  The total number of cVDPV2 cases reported in 2023 remains 12.
  • No cVDPV2 cases were reported this week. There has been one case reported in 2023.
  • No cVDPV2-positive environmental sample was reported this week.
  • No cVDPV1 case was reported this week. The number of 2023 cases remains four.
  • No cVDPV2 case was reported this week. There was one case reported in 2023.
  • No cVDPV2 cases were reported this week. There were two cases reported in 2023.
  • No cVDPV2 cases were reported this week. The total number of cases in 2023 remains 81.
  • No cVDPV2-positive environmental sample was reported this week.
  • The last cVDPV2 case in the country was in October 2021.
  • No cVDPV2 cases were reported this week. There have been five cases reported last year and five cases in 2022.
  • No cVDPV2-positive environmental samples were reported this week.
  • No cVDPV2 case was reported this week. The number of cases for 2023 remains two.
  • No cVDPV2 cases were reported this week. There was one case reported in 2022.
  • No cVDPV2-positive environmental samples were reported this week.
  • No cVDPV2 cases were reported this week. The total number of cases for 2023 remains three.
  • No cVDPV2-positive environmental samples were reported this week.
  • In May 2022, six positive samples were reported following the isolation of vaccine-derived poliovirus type 2 (VDPV2) from environmental samples in London, UK. No cases of paralysis associated with this strain have been detected – virus has been isolated only from environmental (sewage) samples.
  • No cVDPV2 cases were reported this week. One case was reported in New York in September 2022.
  • No cVDPV2 positive environmental samples were reported this week. There were 30 positive samples reported in 2022.
  • No cVDPV2 case was reported in this week. The number of cases in 2023 remains four.
  • No cVDPV2 cases were reported this week. There was one case reported last year.
  • No cVDPV2 cases were reported this week. There is one case reported in 2023.
  • No cVDPV2-positive environmental samples were reported this week.

For more country information, please visit the respective pages within the Outbreak and Endemic country sections of the GPEI website.