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 decreased appears in 1,944 VAERS reports across all vaccines. Of these, 85 reports also mentioned death and 937 involved hospitalization. The severity rate (deaths + hospitalizations as a percentage of reports) is 52.6%. The top vaccines associated with this symptom are COVID-19, HPV (Gardasil), MMR. Remember: VAERS reports show temporal association, not causation.
White blood cell count decreased has been reported 1,944 times in VAERS from 1990 to 2026.
Of these reports, 85 were associated with death (4.37%) and 937 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning White blood cell count decreased is 52.6%.
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.