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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.

⚠️

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 (Fluad Quadrivalent)

Influenza, Seasonal (Fluad Quadrivalent)

FLUA44,184 total reports
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Manufacturers:

Seqirus

Influenza, Seasonal (Fluad Quadrivalent) has 4,184 reports in VAERS spanning from 1990 to 2026. Of these reports, 43 mentioned death, 266 involved hospitalization, and 469 required emergency department visits. This vaccine is manufactured by: Seqirus. This vaccine accounts for 0.2% of all 1,983,260 reports in the VAERS database.

4,184
Total Reports
43
Deaths
266
Hospitalizations
469
ER Visits
83
Disabilities

About Influenza, Seasonal (Fluad Quadrivalent)

Influenza, Seasonal (Fluad Quadrivalent) has 4,184 reports in VAERS spanning from 1990 to 2026.

Of these reports, 43 mentioned death, 266 involved hospitalization, and 469 required emergency department visits.

This vaccine is manufactured by: Seqirus.

This vaccine accounts for 0.2% of all 1,983,260 reports in the VAERS database.

Reporting Rate

This vaccine averages 598 reports per year over 7 years of reporting (2020–2026).

Understanding These Numbers

•Reports don't prove causation. They represent temporal associations where someone experienced an event after vaccination.
•Background rates matter. Many conditions occur naturally and may coincidentally happen after vaccination.
•Reporting varies by vaccine. Newer vaccines or those in the news may have higher reporting rates due to increased awareness.

Most Reported Symptoms

1. Pain in extremity(all)
489
2. Pain(all)
469
3. Injection site pain(all)
411
4. No adverse event(all)
361
5. Extra dose administered(all)
318
6. Pyrexia(all)
313
7. Headache(all)
301
8. Fatigue(all)
281
9. Dizziness(all)
252
10. Product storage error(all)
243

Top Reporting States

1. Florida471
2. Washington313
3. Pennsylvania279
4. California277
5. Michigan258
6. New York171
7. Ohio149
8. Georgia133

Reports by Year

202589
2024418
20231,067
20221,033
2021746
2020704

Explore Further

⚖️ Compare FLUA4 with OthersRead Analysis Articles

Related Analysis

The Denominator ProblemUnderstanding Reporting BiasWhen Do Side Effects Start?Death Reports Deep DiveSerious Outcomes AnalysisMost Common Symptoms

Data Source

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