Key result
Wild poliovirus cases were reported in Afghanistan and Pakistan in 2023, highlighting the ongoing risk of introduction into polio-free countries and the need for high immunization coverage.
Why the study?
The study was conducted to describe the long-term dynamics of wild and vaccine-derived polioviruses circulation from 2014 to 2023 and to describe polio surveillance methods.
The ongoing circulation of wild poliovirus in endemic countries and global presence of VDPV highlight the critical need for maintaining high immunization coverage and improving surveillance.
High immunization coverage must be maintained to avert reintroduction; leaves open optimal surveillance thresholds for polio-free regions.
The study describes the long-term dynamics of wild and vaccine-derived polioviruses (VDPV) circulation from 2014-2023, and to describe polio surveillance methods. Cases of disease caused by wild poliovirus in 2023 were reported in Afghanistan and Pakistan, which, in case of declining vaccination coverage, may lead to the introduction of wild virus into currently polio-free country. This study presents information about various sources VDPV. VDPV were found in environmental objects worldwide and were found to be a major cause of acute flaccid paralysis. The information about poliovirus circulation in this article confirms the need to maintain high immunization coverage with trivalent IPV, to develop m-OPV2 production for rapid outbreak response, and to improve epidemiological surveillance methods.
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Chernyavskaya et al. (2025) conducted a review in Polio. Poliovirus circulation was evaluated. Wild poliovirus cases were reported in Afghanistan and Pakistan in 2023, highlighting the ongoing risk of introduction into polio-free countries and the need for high immunization coverage.
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