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Transparent access to VAERS data for informed decision-making. We present the data as-is, with appropriate context and disclaimers.

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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.

Understanding Vaccine Comparisons

When comparing vaccines in VAERS, keep these critical factors in mind:

  • Doses administered vary enormously. COVID-19 vaccines have hundreds of millions of doses vs. thousands for rare-disease vaccines. Raw report counts cannot be directly compared. See our denominator problem analysis.
  • Reporting rates differ by era. Post-2020 vaccines have much higher reporting rates due to stimulated reporting.
  • Patient populations differ. Some vaccines are given to infants, others to elderly adults. Age alone affects outcome severity.
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