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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.
Dose Series Explorer
Compare adverse event reports across different dose numbers for any vaccine. See how report patterns change from 1st dose through boosters.
104
vaccines with dose data
Up to 6+
doses tracked per vaccine
Dose 1
typically has most reports
⚠️ Interpreting Dose Data
- • First doses typically have more reports because more people receive dose 1 than subsequent doses (dropout effect).
- • Some vaccines show higher 2nd dose reports (like COVID mRNA) — this reflects stronger immune responses, not necessarily greater danger.
- • "UNK" (unknown) means the dose number wasn't recorded in the VAERS report.
- • Death rates by dose can be misleading without knowing the total doses administered per series.