Polio Headlines 17 August, 2022

The border region between Afghanistan and Pakistan remains fragile with 14 cases YTD reported in Pakistan and 1 in Afghanistan. Identified cases in Mozambique have jumped to 4 which brings the world wild polio virus caseload to 19.
Vaccine derived cases continue to be a challenge (see story above) with 230 reported this year. Isolated cases are popping up in the US, UK and Israel where the virus is showing up in waste water.
Wild Polio Virus Summary:
  • New wild poliovirus isolates reported this week:
    AFP cases: 0
    Environment: 0
    Others: 0
    New cVDPV isolates reported this week:
    AFP cases 7
    Environment: 13
    Others:  5

  • Wild poliovirus transmission in Afghanistan is currently at its lowest level in history. Fifty-six children were paralysed by wild polio in 2020. In 2021, the number fell to four. This year to date, only one child has been paralysed, giving the country an extraordinary opportunity to end polio. Read more
  • Summary of new polioviruses this week:
  • Benin: two cVDPV2 positive environmental samples
  • DR Congo: one cVDPV2 positive environmental sample
  • Ghana: four cVDPV2 positive environmental samples
  • Niger: two cVDPV2 cases and one positive environmental sample
  • Nigeria: three cVDPV2 cases and five positive environmental samples
  • Yemen: two cVDPV2 cases
  • Afghanistan:
  • No new wild poliovirus type 1 (WPV1) or circulating vaccine-derived poliovirus type 2 (cVDPV2) cases were reported this week. There is one WPV1 case reported in 2022 and four in 2021. The total number of cVDPV2 cases remains 43.
  • Pakistan: 
  • No new wild poliovirus type 1 case was reported this week. The number of 2022 cases remains 14. In 2021, the number of WVP1 cases was one and the number of cVDPV2 cases was eight.
  • Seven WPV1 positive environmental samples were reported; four in Khyber Pakhtunkhwa, two in Punjab and one in Islamabad.
  • Mozambique: 
  • No case of wild poliovirus type 1 (WPV1) was reported this week. There are four WPV1 cases in the country. Reporting of these new cases within a short time span indicates that intensified surveillance efforts are working in the province.  
  • Mozambique has implemented three immunization rounds using bOPV since the detection of the first case from March.  Assessments of these rounds show gradual improvements in quality, round to round, though quality remains suboptimal in Tete province. 
  • A field investigation is ongoing in response to these latest cases, with focus on surveillance and to more clearly assess geographical scope of circulation, and to ultimately guide future response plans.
Officially reported WPV1 and cVDPV cases as of 16 August 2022
Wild poliovirus (WPV) 
Total global WPV1 cases in 2022: 19 (compared with 2 for the same period in 2021)
Total global WPV1 cases in 2021: 6
Circulating vaccine-derived poliovirus (cVDPV) cases
Total global cVDPV cases in 2022: 230 (compared with 210 for the same period in 2021)
Total global cVDPV cases in 2021: 698