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Data source: VAERS (Vaccine Adverse Event Reporting System)

Data through 2026 · Updated quarterly

Built by TheDataProject.ai · © 2026 VaccineWatch

Important: VAERS accepts reports of adverse events following vaccination. For any given report, there is no certainty that the reported event was caused by the vaccine. Reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable. Most reports to VAERS are voluntary, which means they are subject to biases. This data cannot be used to determine if vaccines cause or contribute to adverse events.

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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.

  1. Home
  2. Vaccines
  3. Influenza, Seasonal (Flulaval Quadrivalent)
  4. Injection site discomfort
Influenza, Seasonal (Flulaval Quadrivalent)×Injection site discomfort

Injection site discomfort Reports for Influenza, Seasonal (Flulaval Quadrivalent)

#201 most reported symptom for this vaccine

150
Reports
0
Deaths
1
Hospitalizations
0
Mortality Rate
%
0.7
Hosp. Rate
%

Injection site discomfort and Influenza, Seasonal (Flulaval Quadrivalent)

Injection site discomfort has been reported 150 times in association with Influenza, Seasonal (Flulaval Quadrivalent) vaccination in VAERS. This represents 0.3% of all 52,111 reports for this vaccine.

Among these reports, 0 mentioned death (0.00%) and 1 involved hospitalization (0.7%).

Injection site discomfort is the #201 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 150 reports of Injection site discomfort after Influenza, Seasonal (Flulaval Quadrivalent) vaccination may seem alarming, but context is critical.

The mortality rate among these reports is very low at 0.00%, suggesting most cases are non-fatal.

Important Context

•Association, not causation: These reports show Injection site discomfort occurred after vaccination, not that the vaccine caused it.
•Background rates: Injection site discomfort may occur naturally at baseline rates in the population, unrelated to vaccination.
•Anyone can report: VAERS accepts reports from anyone — patients, parents, healthcare providers — without requiring medical verification.
•Denominator missing: VAERS counts reports, not rates per dose. Without knowing how many doses were given, raw counts can be misleading. Learn more →

Similarly Ranked Symptoms

Dysgeusia154 reportsPharyngeal swelling153 reportsComputerised tomogram head normal149 reportsWrong technique in product usage process149 reports

Quick Facts

Reports:150
Deaths:0
Hospitalizations:1
% of Vaccine:0.3%
Rank:#201 of 2354

Related Pages

Influenza, Seasonal (Flulaval Quadrivalent) OverviewInjection site discomfort (All Vaccines)Why Raw Numbers MisleadTop Symptoms Analysis

Data Source

This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.