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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. Grand mal convulsion
Hib (Pedvaxhib)×Grand mal convulsion

Grand mal convulsion Reports for Hib (Pedvaxhib)

#117 most reported symptom for this vaccine

287
Reports
11
Deaths
164
Hospitalizations
3.83
Mortality Rate
%
57.1
Hosp. Rate
%

Grand mal convulsion and Hib (Pedvaxhib)

Grand mal convulsion has been reported 287 times in association with Hib (Pedvaxhib) vaccination in VAERS. This represents 0.5% of all 60,298 reports for this vaccine.

Among these reports, 11 mentioned death (3.83%) and 164 involved hospitalization (57.1%).

Grand mal convulsion is the #117 most frequently reported symptom for Hib (Pedvaxhib) out of 2013 total symptoms.

Disclaimer: VAERS reports describe events that occurred after vaccination but do not establish that the vaccine caused the event. Many reported symptoms may be coincidental or related to underlying conditions.

What This Means

Seeing 287 reports of Grand mal convulsion after Hib (Pedvaxhib) vaccination may seem alarming, but context is critical.

The mortality rate of 3.83% warrants monitoring, though VAERS deaths represent temporal associations, not confirmed causal links.

Important Context

•Association, not causation: These reports show Grand mal convulsion occurred after vaccination, not that the vaccine caused it.
•Background rates: Grand mal convulsion may occur naturally at baseline rates in the population, unrelated to vaccination.
•Anyone can report: VAERS accepts reports from anyone — patients, parents, healthcare providers — without requiring medical verification.
•Denominator missing: VAERS counts reports, not rates per dose. Without knowing how many doses were given, raw counts can be misleading. Learn more →

Similarly Ranked Symptoms

Electroencephalogram abnormal297 reportsBlood culture negative294 reportsErythema multiforme280 reportsProduct preparation issue267 reports

Quick Facts

Reports:287
Deaths:11
Hospitalizations:164
% of Vaccine:0.5%
Rank:#117 of 2013

Related Pages

Hib (Pedvaxhib) OverviewGrand mal convulsion (All Vaccines)Why Raw Numbers MisleadTop Symptoms Analysis

Data Source

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