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.
Influenza, Seasonal (Flulaval Quadrivalent) in 2020
6,664 adverse event reports (+38% vs 2019)
2020 Reporting Summary
In 2020, 6,664 adverse event reports were filed for Influenza, Seasonal (Flulaval Quadrivalent) in VAERS. This represents 12.8% of all 52,111 reports for this vaccine.
Of these reports, 25 mentioned death, 198 involved hospitalization, 767 required ER visits, and 105 reported disability.
Compared to the average of 3,877 reports per year for this vaccine, 2020 was above average (+72%).
💡 What This Means
In 2020, 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.
All Years for Influenza, Seasonal (Flulaval Quadrivalent)
Understanding Yearly Data
Quick Facts
Related Pages
Data Source
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.