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Vaccine Adverse Event Reporting Systems

Vaccine adverse event reporting systems such as VAERS are national, passive surveillance tools designed to collect reports of health problems that occur after vaccination.

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Feb 7, 2026

How do vaccine adverse event reporting systems (like VAERS) work and why they cannot by themselves prove causation?

such as VAERS are national, passive surveillance tools designed to collect reports of health problems that occur after vaccination so experts can spot unusual patterns or “signals” that merit further ...