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.
1,983,260Vaccine Adverse Event Reports
Exposed. Explored. Explained.
Transparent access to 35 years of VAERS data (1990–2026). We present the numbers with context, not conclusions.
How VAERS Works
Understanding the pipeline from adverse event to public data
Report Filed
Anyone — doctors, patients, family members, or manufacturers — can submit a report of an adverse event after vaccination.
CDC/FDA Reviews
Reports are collected by CDC and FDA. Serious reports may trigger follow-up investigations and safety signal analysis.
Data Published
Raw data is published publicly. We process it into searchable, contextualized analysis — that's what you see here.
⚠️ Important: VAERS reports show temporal associations, not proven causation. A report means something happened after vaccination — not necessarily because of it.
Key Numbers at a Glance
These are the raw numbers from VAERS. Remember: reports don't prove causation, but transparency is essential for informed decision-making.
COVID-19 vs All Other Vaccines
COVID-19 vaccines fundamentally changed VAERS reporting. Here's the scale of the difference.
Note: Some reports involve multiple vaccines, so percentages may exceed 100% when combined.
35 Years of VAERS Reporting
See how adverse event reporting has changed over time. Note the dramatic spike in 2021 with COVID-19 vaccine rollout.
Popular Searches
Quick access to the most frequently explored vaccines, symptoms, and analyses.
Top 10 Vaccines by Reports
The most-reported vaccines in VAERS. Higher counts primarily reflect widespread use, not higher risk.
Recent Analysis
In-depth articles exploring trends and patterns in VAERS data with full context.
Why Raw VAERS Numbers Can Be Misleading
The most critical limitation: 670M+ COVID doses make raw counts meaningless without context
9 min readWhen Do Vaccine Side Effects Start?
73% of adverse events occur within 3 days — the timing patterns explained
7 min readUnderstanding Vaccine Lot Numbers
4,414 COVID lots tracked — why comparing lots by report counts is misleading
8 min readFirst Dose vs Second Dose vs Booster
How adverse event patterns change across COVID-19 vaccine doses
6 min readThe COVID-19 Impact on VAERS
How the pandemic changed vaccine adverse event reporting forever
8 min readSerious vs Non-Serious Outcomes
Understanding the spectrum of adverse event severity
7 min readWhat is VAERS?
The Vaccine Adverse Event Reporting System (VAERS) is a passive surveillance system jointly managed by the CDC and FDA. It accepts reports of adverse events following vaccination.
Anyone can report to VAERS — healthcare providers, vaccine manufacturers, patients, or family members. This openness is both a strength (captures a wide range of potential signals) and a limitation (reports aren't verified).
Key limitations: Reports alone don't prove causation. They might be coincidental, incomplete, or inaccurate. But they're still valuable for safety signal detection.
Why This Matters
- Transparency: The public deserves access to this data
- Context: Raw numbers need proper interpretation
- Education: Understanding helps informed decisions
- Balance: Neither pro-vax nor anti-vax — just data
Explore the Data
Dive deep into vaccines, symptoms, and analysis. Every number tells a story, but context is everything.
Important Reminder
This website presents VAERS data for transparency and education. Reports in VAERS do not prove that vaccines caused the reported adverse events.Always consult healthcare professionals for medical decisions. Our goal is informed transparency, not medical advice.