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.
Injection site swelling Reports for Influenza, Seasonal (Flulaval Quadrivalent)
#6 most reported symptom for this vaccine
Injection site swelling and Influenza, Seasonal (Flulaval Quadrivalent)
Injection site swelling has been reported 4,371 times in association with Influenza, Seasonal (Flulaval Quadrivalent) vaccination in VAERS. This represents 8.4% of all 52,111 reports for this vaccine.
Among these reports, 2 mentioned death (0.05%) and 56 involved hospitalization (1.3%).
Injection site swelling is the #6 most frequently reported symptom for Influenza, Seasonal (Flulaval Quadrivalent) out of 2354 total symptoms.
Disclaimer: VAERS reports describe events that occurred after vaccination but do not establish that the vaccine caused the event. Many reported symptoms may be coincidental or related to underlying conditions.
What This Means
Seeing 4,371 reports of Injection site swelling after Influenza, Seasonal (Flulaval Quadrivalent) vaccination may seem alarming, but context is critical.
The mortality rate among these reports is very low at 0.05%, suggesting most cases are non-fatal.
Important Context
Similarly Ranked Symptoms
Quick Facts
Related Pages
Data Source
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.