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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.

White blood cell count increased

6,886 total reports64.4% serious outcomes

6,886

Total Reports

422

Deaths

4,012

Hospitalizations

64.4

Severity Rate

% serious outcomes

About White blood cell count increased Reports

White blood cell count increased has been reported 6,886 times in VAERS from 1990 to 2026.

Of these reports, 422 were associated with death (6.13%) and 4,012 involved hospitalization.

The overall serious outcome rate (death or hospitalization) for reports mentioning White blood cell count increased is 64.4%.

Understanding White blood cell count increased in VAERS

•Temporal association only: These reports show White blood cell count increased 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 White blood cell count increased. 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.