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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.

Unevaluable event

20,049 total reports20.7% serious outcomes

Unevaluable event appears in 20,049 VAERS reports across all vaccines. Of these, 625 reports also mentioned death and 3,530 involved hospitalization. The severity rate (deaths + hospitalizations as a percentage of reports) is 20.7%. The top vaccines associated with this symptom are COVID-19, Hepatitis B, Unknown Vaccine. Remember: VAERS reports show temporal association, not causation.

20,049

Total Reports

625

Deaths

3,530

Hospitalizations

20.7

Severity Rate

% serious outcomes

About Unevaluable event Reports

Unevaluable event has been reported 20,049 times in VAERS from 1990 to 2026.

Of these reports, 625 were associated with death (3.12%) and 3,530 involved hospitalization.

The overall serious outcome rate (death or hospitalization) for reports mentioning Unevaluable event is 20.7%.

Understanding Unevaluable event in VAERS

•Temporal association only: These reports show Unevaluable event occurred after vaccination, not necessarily because of vaccination.

•Background rates matter: Many symptoms occur naturally at baseline rates in the population, unrelated to vaccination.

•Reporting variability: Medical terminology may be used differently by various healthcare providers and over time.

•Investigation needed: High-frequency reports may trigger further epidemiological studies to determine causation.

What This Data Shows

Most Associated Vaccines: The vaccines most frequently mentioned in reports with Unevaluable event. This may reflect usage patterns, not causation.

Severity Patterns: The percentage of reports that involve serious outcomes can help prioritize safety investigations.

Reporting Trends: Changes in reporting frequency over time may reflect increased awareness, media attention, or actual safety signals.