Progress Toward Poliomyelitis Eradication — Pakistan, January 2020–July 2021

Abstract

SIAs are mass house-to-house vaccination campaigns targeting children aged <5 years with OPV, regardless of the child's vaccination history.and Gavi, the Vaccine Alliance, indicated that the proportion of fully immunized children aged 12-23 months, by province, ranged from 37.5% in Balochistan to 88.9% in Punjab. None of the districts in the provinces of Balochistan, Khyber Pakhtunkhwa, and Sindh achieved ≥80% coverage amongThe MMWR series of publications is published by the

Progress Toward Poliomyelitis Eradication — Pakistan, January 2021–July 2022

“…The reemergence of WPV cases in Pakistan after 14 months with no case detection has uncovered transmission in southern Khyber Pakhtunkhwa province, the most historically challenging area. This report describes Pakistan's progress toward polio eradication during January 2021-July 2022 and updates previous reports (4,5). As of August 20, 2022, all but one of the 14 WPV1 cases in Pakistan during 2022 have been reported from North Waziristan district in Khyber Pakhtunkhwa.…”

Surveillance to Track Progress Toward Polio Eradication — Worldwide, 2020–2021

“…In Afghanistan, WPV1 was isolated from only one environmental surveillance sample in 2021 compared with 35 samples from 15 sites in 2020 ( 7 ). In Pakistan, WPV1-positive samples also declined from 434 across 67 sites in 2020 to 65 across 34 sites in 2021 ( 8 ).…”

Outbreaks of Circulating Vaccine-Derived Poliovirus in the World Health Organization Western Pacific Region, 2000–2021

“…The rates of symptomatic poliomyelitis cases among the infected individuals were around 0.7% even in those infected with wild polioviruses (108) and much higher asymptomatic infection rates for cVDPVs are expected in communities with polio immunization under current realistic conditions. To supplement AFP surveillance, the importance of environmental surveillance to monitor the transmission of wild and vaccine-derived polioviruses is currently increasing, especially in the settings where AFP surveillance is not functioning well for various reasons (99,109,110). In the WPR, the attempt to apply the environmental surveillance for OPV-derived polioviruses was pioneered in Japan (111,112), and the methodological approaches have been transferred and introduced in China (48,62-64,110).…”