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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.

⚠️

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 + Hepatitis B (Comvax)

Hib + Hepatitis B (Comvax)

HBHEPB6,793 total reports
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Manufacturers:

Merck & Co.Unknown Manufacturer

Hib + Hepatitis B (Comvax) has 6,793 reports in VAERS spanning from 1990 to 2026. Of these reports, 434 mentioned death, 1,185 involved hospitalization, and 3,242 required emergency department visits. This vaccine is manufactured by: Merck & Co., Unknown Manufacturer. This vaccine accounts for 0.3% of all 1,983,260 reports in the VAERS database.

6,793
Total Reports
434
Deaths
1,185
Hospitalizations
3,242
ER Visits
169
Disabilities
⚠️Death reporting rate (6.4%) is 4.6× the database average. This may reflect the patient population, not vaccine safety.

About Hib + Hepatitis B (Comvax)

Hib + Hepatitis B (Comvax) has 6,793 reports in VAERS spanning from 1990 to 2026.

Of these reports, 434 mentioned death, 1,185 involved hospitalization, and 3,242 required emergency department visits.

This vaccine is manufactured by: Merck & Co., Unknown Manufacturer.

This vaccine accounts for 0.3% of all 1,983,260 reports in the VAERS database.

Reporting Rate

This vaccine averages 283 reports per year over 24 years of reporting (1997–2025).

Understanding These Numbers

•Reports don't prove causation. They represent temporal associations where someone experienced an event after vaccination.
•Background rates matter. Many conditions occur naturally and may coincidentally happen after vaccination.
•Reporting varies by vaccine. Newer vaccines or those in the news may have higher reporting rates due to increased awareness.

Most Reported Symptoms

1. Pyrexia(all)
2,122
2. Injection site erythema(all)
654
3. Rash(all)
650
4. Irritability(all)
603
5. Convulsion(all)
598
6. Crying(all)
508
7. Vomiting(all)
478
8. Agitation(all)
401
9. Screaming(all)
394
10. Diarrhoea(all)
375

Top Reporting States

1. California771
2. New York336
3. Georgia313
4. Ohio304
5. Illinois289
6. Florida240
7. Pennsylvania228
8. Texas191

Reports by Year

202514
201713
201628
201555
201434
201328
201214
20119
201016
200931

Explore Further

⚖️ Compare Hib + Hepatitis B (Comvax) with OthersRead Analysis Articles

Related Analysis

The Denominator ProblemUnderstanding Reporting BiasWhen Do Side Effects Start?Death Reports Deep DiveSerious Outcomes AnalysisMost Common Symptoms

Data Source

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