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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.
Multi-Vaccine Interaction Explorer
When multiple vaccines are administered at the same visit, adverse events get reported under all vaccines given. This tool shows which combinations appear most frequently in VAERS and their associated outcomes.
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⚠️ Important Context
- • Co-administration is standard practice — multiple vaccines at one visit is routine, especially in childhood schedules
- • High report counts ≠ higher risk — common combinations naturally have more reports because more people receive them
- • Deaths and hospitalizations reflect patient outcomes after vaccination, not confirmed vaccine-caused events
- • VAERS cannot determine if a specific combination caused worse outcomes than individual vaccines