14/08/2026
AFENET, with technical and financial support from the U.S. CDC, is supporting NPHCDA, in collaboration with the National Expert Committee (NEC) on Adverse Events Following Immunization (AEFI) and other vaccine safety stakeholders, to conduct a National AEFI Causality Assessment Meeting from 11–14 August 2026 in Ikeja, Lagos State.
The four-day technical meeting brings together national experts, representatives of government institutions, and partner organizations to review 36 serious AEFI cases systematically reported through Nigeria’s vaccine safety surveillance system.
Through evidence-based review of clinical histories, investigation reports, vaccination information, laboratory findings, and other relevant documentation, the NEC is applying internationally recognized approaches to determine causality and guide appropriate follow-up.
The meeting is expected to:
• Complete the scientific review and causality assessment of serious AEFI cases for which adequate information is available
• Document the causality classification and conclusions reached for each assessed case
• Identify cases requiring additional investigation or documentation before a definitive classification can be made
• Identify recurring gaps in AEFI reporting, investigation, and documentation
• Develop recommendations for appropriate follow-up and corrective actions where necessary
• Generate lessons to strengthen AEFI surveillance, investigation, data quality, and Vaccine-Related Event preparedness and response at national and subnational levels.
Findings from the assessment will help improve the quality and use of vaccine safety surveillance data and identify areas where additional investigation, capacity building, coordination, or system strengthening may be required.
The meeting forms part of ongoing national efforts to strengthen AEFI surveillance and Vaccine-Related Event preparedness and response in Nigeria, ensuring that potential vaccine safety concerns are detected early, appropriately investigated, scientifically assessed, and effectively communicated.