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.
Platelet count decreased appears in 4,498 VAERS reports across all vaccines. Of these, 304 reports also mentioned death and 2,891 involved hospitalization. The severity rate (deaths + hospitalizations as a percentage of reports) is 71.0%. The top vaccines associated with this symptom are COVID-19, MMR, Chickenpox (Varivax). Remember: VAERS reports show temporal association, not causation.
Platelet count decreased has been reported 4,498 times in VAERS from 1990 to 2026.
Of these reports, 304 were associated with death (6.76%) and 2,891 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Platelet count decreased is 71.0%.
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.