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.
Haemoglobin decreased appears in 3,629 VAERS reports across all vaccines. Of these, 382 reports also mentioned death and 2,522 involved hospitalization. The severity rate (deaths + hospitalizations as a percentage of reports) is 80.0%. The top vaccines associated with this symptom are COVID-19, Rotavirus (RotaTeq), Hib. Remember: VAERS reports show temporal association, not causation.
Haemoglobin decreased has been reported 3,629 times in VAERS from 1990 to 2026.
Of these reports, 382 were associated with death (10.53%) and 2,522 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Haemoglobin decreased is 80.0%.
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.