Abstract
OBJECTIVE: To describe the process of restructuring the National Expert Committee and its impact on the causality assessment of events supposedly attributable to vaccination or immunization (ESAVI) in the context of vaccine safety monitoring during the COVID-19 pandemic, 2020-2023. METHOD: A report was prepared on the experience of creating and operating Mexico's National Expert Committee during the aforementioned period. RESULTS: During the 2020-2023 period, 1293 severe ESAVIs were reported after COVID-19 vaccination; after 98.6% (1275) of them had been assessed and classified, 10 specialized subcommittees were formed. CONCLUSIONS: Restructuring of the committee, assessment of adverse events with a series of prior steps, and use of the World Health Organization's causality assessment tool made it possible to generate scientific documents to validate vaccine safety and maintain trust in vaccination.