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.
3,325 adverse event reports (+580% vs 1990)
In 1991, 3,325 adverse event reports were filed for Polio (Oral) in VAERS. This represents 12.3% of all 27,089 reports for this vaccine.
Of these reports, 119 mentioned death, 453 involved hospitalization, 1,515 required ER visits, and 37 reported disability.
Compared to the average of 1,653 reports per year for this vaccine, 1991 was above average (+101%).
Year-over-year change: The large change from 1990 likely reflects a ramp-up in vaccination (e.g., new vaccine rollout or expanded eligibility) rather than a change in per-dose risk.
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.