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.
4,411 adverse event reports (+381% vs 1990)
In 1991, 4,411 adverse event reports were filed for DTP in VAERS. This represents 18.5% of all 23,850 reports for this vaccine.
Of these reports, 133 mentioned death, 582 involved hospitalization, 1,920 required ER visits, and 56 reported disability.
Compared to the average of 949 reports per year for this vaccine, 1991 was above average (+365%).
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.