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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 Comparison Tool

Compare adverse event patterns across different vaccine doses. Explore how first doses, second doses, and boosters differ in their VAERS reporting patterns.

130%
more 2nd dose reports
Expected
stronger immune response
3 doses
compared side-by-side

Understanding Dose Differences

  • • Second doses often generate more reports due to stronger immune responses
  • • This pattern is expected and reflects proper immune system functioning
  • • Booster patterns may differ due to longer intervals and different demographics
  • • Rate differences may reflect population characteristics, not inherent safety differences