The World Health Organization warns that cross-border spread, regional security challenges, and funding shortfalls continue to threaten global poliovirus eradication targets.
RT’s Three Key Takeaways:
- Emergency Status Maintained: The World Health Organization determined that the spread of poliovirus continues to represent a public health emergency of international concern, though officials advised it does not constitute a pandemic emergency.
- Ongoing Regional Transmission: Endemic wild poliovirus type 1 remains active across cross-border corridors in Afghanistan and Pakistan, while circulating vaccine-derived poliovirus strains continue to generate cases across multiple nations.
- Operational and Resource Strain: Eradication efforts face substantial operational hurdles, including access restrictions due to conflict, suspended door-to-door vaccination campaigns in key regions, and an estimated 30% programme financial shortfall.
The World Health Organization (WHO) has determined that the international spread of poliovirus continues to constitute a public health emergency of international concern (PHEIC), according to a statement released following the 45th meeting of the International Health Regulations (IHR) Emergency Committee.
WHO director-general Tedros Adhanom Ghebreyesus accepted the committee’s assessment on Aug 21, 2026, extending temporary recommendations under the IHR to curb the international spread of wild poliovirus type 1 (WPV1) and circulating vaccine-derived polioviruses (cVDPV). The committee advised that while poliovirus remains a global health emergency, the current situation does not constitute a pandemic emergency under amended IHR provisions that entered into force in September 2025.
Endemic Wild Poliovirus Transmission
Endemic transmission of WPV1 remains restricted to two countries: Afghanistan and Pakistan. According to WHO surveillance data, 16 new WPV1 cases were reported between January 2026 and mid-May 2026, with 14 identified in Afghanistan and two in Pakistan. For 2026 through the reporting period, four cases had onset in 2026, consisting of three in Afghanistan and one in Pakistan. In 2025, the two countries recorded 52 total cases, including 21 in Afghanistan and 31 in Pakistan.
Environmental surveillance documented 74 positive WPV1 samples in 2026 as of the committee review, with 17 found in Afghanistan and 57 in Pakistan. Although the committee noted an overall downward trajectory in case counts and positive environmental detections, transmission persisted through the typical low-transmission season between October 2025 and April 2026.
Transmission remains concentrated in three primary areas: the South Region of Afghanistan, South Khyber Pakhtunkhwa in Pakistan, and Karachi, Pakistan. The committee emphasized that Afghanistan and Pakistan function as a single epidemiological bloc, noting that cross-border population mobility and returning migrants continue to challenge disease control.
Delivery of oral and injectable vaccines faces substantial regional hurdles. In Afghanistan, house-to-house vaccination campaigns have been suspended since October 2024 due to security issues, requiring healthcare teams to use site-to-site distribution. The committee reported that site-to-site approaches frequently miss younger children, compounded by low participation rates of female healthcare personnel in the South Region. In Pakistan, security concerns in South Khyber Pakhtunkhwa have left an estimated 250,000 children unreached.
Vaccine-Derived Strains and Global Vulnerabilities
Parallel to wild strains, circulating vaccine-derived polioviruses continue to pose significant public health risks. Through April 30, 2026, 32 cVDPV cases and 27 environmental detections were identified across 12 nations globally. The majority of these cases, 28 in total, involved cVDPV type 2 (cVDPV2), while type 1 and type 3 each accounted for two cases.
Nigeria reported the highest regional burden, representing 14 of the 28 global cVDPV2 cases in early 2026 after accounting for 66 of 238 worldwide cases in 2025. The country also reported co-circulation of both cVDPV2 and cVDPV3. Ongoing outbreaks also remain active in areas such as Yemen, where access constraints have halted vaccination responses in northern governorates, and Somalia, where insecurity leaves more than 450,000 children unreached.
Cross-border importations continue to demonstrate global vulnerability. Genetic sequencing identified at least 13 documented cVDPV international importation events between January 2025 and January 2026. Surveillance also detected isolated international signals, including WPV1 positive wastewater samples in Germany in October 2025, with no subsequent detections reported thereafter.
Financial and Structural Pressures
The Global Polio Eradication Initiative (GPEI) targets the interruption of endemic WPV1 transmission in 2026 and the cessation of cVDPV2 outbreaks by 2028. However, the committee warned that structural constraints threaten these timelines.
The committee reported that the eradication programme faces an estimated financial shortfall of nearly 30%, driven by wider fiscal pressures across the global healthcare sector, rising fuel costs, and logistical expenses. Because of these financial limitations, the GPEI cannot support preventive campaigns using bivalent oral polio vaccine in countries without active transmission of poliovirus types 1 or 3.
The committee urged donor countries and international partners to increase funding, advising affected countries to integrate polio immunization into domestic budgets, strengthen routine healthcare services, and maintain active wastewater and acute flaccid paralysis surveillance to avoid undetected viral circulation.
