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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.

Abnormal behaviour

3,013 total reports21.2% serious outcomes

3,013

Total Reports

Deaths

551

Hospitalizations

21.2

Severity Rate

% serious outcomes

About Abnormal behaviour Reports

Abnormal behaviour has been reported 3,013 times in VAERS from 1990 to 2026.

Of these reports, 89 were associated with death (2.95%) and 551 involved hospitalization.

The overall serious outcome rate (death or hospitalization) for reports mentioning Abnormal behaviour is 21.2%.

Understanding Abnormal behaviour in VAERS

•Temporal association only: These reports show Abnormal behaviour 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 Abnormal behaviour. 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.