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.
Thrombosis appears in 6,547 VAERS reports across all vaccines. Of these, 454 reports also mentioned death and 2,331 involved hospitalization. The severity rate (deaths + hospitalizations as a percentage of reports) is 42.5%. The top vaccines associated with this symptom are COVID-19, Unknown Vaccine, HPV (Gardasil). Remember: VAERS reports show temporal association, not causation.
Thrombosis has been reported 6,547 times in VAERS from 1990 to 2026.
Of these reports, 454 were associated with death (6.93%) and 2,331 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Thrombosis is 42.5%.
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.