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.
Exposed. Explored. Explained.
Transparent access to 35 years of VAERS data (1990–2026). We present the numbers with context, not conclusions.
Neither pro-vaccine nor anti-vaccine — pro-transparency.Data updated through February 2026 · Source: CDC/FDA VAERS
Understanding the pipeline from adverse event to public data
Anyone — doctors, patients, family members, or manufacturers — can submit a report of an adverse event after vaccination.
Reports are collected by CDC and FDA. Serious reports may trigger follow-up investigations and safety signal analysis.
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.
These are the raw numbers from VAERS. Remember: reports don't prove causation, but transparency is essential for informed decision-making.
COVID-19 vaccines fundamentally changed VAERS reporting. Here's the scale of the difference.
ⓘ Percentages are calculated from vaccine-level reports, not unique reports. A single report listing both COVID-19 and flu vaccines counts toward both categories, so percentages add up to more than 100%.
See how adverse event reporting has changed over time. Note the dramatic spike in 2021 with COVID-19 vaccine rollout.
Quick access to the most frequently explored vaccines, symptoms, and analyses.
Tools you won't find on any other VAERS site. Real pharmacovigilance methods, made accessible.
How many adverse events per million doses? Combines VAERS data with CDC dose estimates — the single most important context missing from raw VAERS numbers.
Calculate rates →FDA-style PRR analysis across 1.98M reports. 5,225 safety signals detected — see which adverse events are disproportionately reported for each vaccine.
Explore signals →The most-reported vaccines in VAERS. Higher counts primarily reflect widespread use, not higher risk.
In-depth articles exploring trends and patterns in VAERS data with full context.
The most critical limitation: 670M+ COVID doses make raw counts meaningless without context
Feb 2026 · 9 min read73% of adverse events occur within 3 days — the timing patterns explained
Feb 2026 · 7 min read4,414 COVID lots tracked — why comparing lots by report counts is misleading
Feb 2026 · 8 min readHow adverse event patterns change across COVID-19 vaccine doses
Feb 2026 · 6 min readHow the pandemic changed vaccine adverse event reporting forever
Feb 2026 · 8 min readUnderstanding the spectrum of adverse event severity
Feb 2026 · 7 min readData-driven guides to reported side effects for the most common vaccines.
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.
Dive deep into vaccines, symptoms, and analysis. Every number tells a story, but context is everything.
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.