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Fourteen systematic reviews and meta-analyses covering over 230 million participants were synthesized in this umbrella review. The review, authored by Chengyan Jin and last updated in May 2026, critically evaluates evidence on influenza vaccination effectiveness and safety in high-risk populations. It assesses outcomes including major cardiovascular events, mortality, and COPD exacerbations.
The primary data file is a DOCX document summarizing review findings, not a structured dataset of primary study results.