Important: VAERS reports alone cannot determine if a vaccine caused an adverse event. Reports may contain incomplete, inaccurate, or unverified information. Correlation does not equal causation.
5,469 adverse event reports (-18% vs 2020)
In 2021, 5,469 adverse event reports were filed for Influenza, Seasonal (Flulaval Quadrivalent) in VAERS. This represents 10.5% of all 52,111 reports for this vaccine.
Of these reports, 45 mentioned death, 201 involved hospitalization, 638 required ER visits, and 112 reported disability.
Compared to the average of 3,877 reports per year for this vaccine, 2021 was above average (+41%).
In 2021, reporting for Influenza, Seasonal (Flulaval Quadrivalent) was within typical ranges. As always, VAERS data reflects reports filed, not confirmed adverse events. Trends should be interpreted alongside vaccination volume and population health data.
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.