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Data source: VAERS (Vaccine Adverse Event Reporting System)

Data through 2026 · Updated quarterly

Built by TheDataProject.ai · © 2026 VaccineWatch

Important: VAERS accepts reports of adverse events following vaccination. For any given report, there is no certainty that the reported event was caused by the vaccine. Reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable. Most reports to VAERS are voluntary, which means they are subject to biases. This data cannot be used to determine if vaccines cause or contribute to adverse events.

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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.

  1. Home
  2. Vaccines
  3. Hib (Pedvaxhib)
  4. 1991
Hib (Pedvaxhib)1991

Hib (Pedvaxhib) in 1991

2,922 adverse event reports (+999% vs 1990)(first full year of widespread reporting)

Share
2,922
Reports
117
Deaths
479
Hospitalizations
1,369
ER Visits
28
Disabilities
← 1990 (168 reports)1992 (3,324 reports) →

1991 Reporting Summary

In 1991, 2,922 adverse event reports were filed for Hib (Pedvaxhib) in VAERS. This represents 4.8% of all 60,298 reports for this vaccine.

Of these reports, 117 mentioned death, 479 involved hospitalization, 1,369 required ER visits, and 28 reported disability.

Compared to the average of 1,550 reports per year for this vaccine, 1991 was above average (+89%).

💡 What This Means

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.

All Years for Hib (Pedvaxhib)

YearReportsDeathsHosp.
20258881476
20241,0251747
20231,003823
20229021222
20219351241
20209921452
20191,21814101
20181,1502383
20171,57324115
20161,62928122
20151,72724120
20141,53726192
20131,27728151
201295226120
20111,03018143
20101,19958126
20091,08748159
20081,98588400
20072,41281491
20061,81856218
20051,71159194
20041,76477202
20031,60560187
20021,70979180
20011,79969211
20001,75562214
19991,79164331
19981,34767180
19971,14747161
19961,15333166
19951,97343298
19942,45698359
19932,819141409
19923,324154469
1991 ← current2,922117479
19901681045

Understanding Yearly Data

•Spikes may reflect awareness: Years with unusual activity (e.g., pandemic) often see increased reporting.
•Dose volume matters: More vaccinations given in a year naturally leads to more reports.
•Reporting lag: Some events are reported months after they occur, so recent years may be incomplete.

Quick Facts

Reports:2,922
Deaths:117
Hospitalizations:479
% of Total:4.8%
Rank (by vol.):#2 of 36 years
Avg/year:1,550

Related Pages

Hib (Pedvaxhib) Overview← 1990 Reports1992 Reports →35 Years of ReportingCompare Vaccines

Data Source

This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.