Haemophilus Influenzae Type b Vaccine (Meningococcal Protein Conjugate)

Why get vaccinated?

Haemophilus influenza type b vaccine is used to prevent Haemophilus influenzae infections.

Infection with Haemophilus influenzae can cause the following: ear infections, bronchitis (inflammation of the lungs), or a serious infection of the brain that can cause permanent damage or death. The vaccine works by triggering your immune system to build a defense to Haemophilus influenzae when it comes in contact with the Haemophilus influenzae bacteria.

How is the vaccine given?

Haemophilus influenza type b conjugate vaccine comes as a suspension (liquid) to be given intramuscularly (into a muscle) by a healthcare provider. The vaccine is given to infants and children less than 6 years of age based on age and prior vaccine status.

For infants 2 to 14 months of age: Haemophilus influenza type b conjugate vaccine is given as 2 doses given 2 months apart. If both doses are given before 12 months of age, then a booster dose is given at 12 to 15 months of age at least 2 months after the second dose.

For children 15 to 71 months of age: Haemophilus influenza type b conjugate vaccine is given as a single dose.

What should you tell the person who is giving the vaccine?

Tell your vaccine provider if you:

• have had an allergic reaction to this vaccine, any part of this vaccine, any other vaccine or any drug, food or substance. Tell your vaccine provider about the allergy and what symptoms you had.
• have a weakened immune system due to a condition or medication you are receiving.
• have a fever or are feeling unwell on the day of administration.

In some cases, your health care provider may decide to postpone vaccination to a future visit.

What are the risks from vaccination?

Side effects that have been reported with Haemophilus influenza type b conjugate vaccine include:

• fever
• irritability, prolonged or high-pitched crying
• sleepiness
• diarrhea, vomiting
• redness, swelling, pain at the site of injection

Some side effects can be serious. If you experience any of these symptoms, call your doctor immediately or get emergency medical treatment:

• seizures
• rash, hives, difficulty breathing, swelling of the throat or face

People sometimes faint after medical procedures, including vaccination. Tell your provider if you feel dizzy or have vision changes or ringing in the ears.

Adverse reactions should be reported to the Vaccine Adverse Event Reporting System (VAERS). Your health care provider will usually file this report, or you can do it yourself. Visit https://vaers.hhs.gov or call 1-800-822-7967. VAERS is only for reporting reactions, and VAERS staff members do not give medical advice.

How can I learn more?

• Read the Vaccine Information Sheet (VIS) that your vaccine provider will give you or you can obtain it at https://www.cdc.gov/vaccines/hcp/current-vis/index.html
• Ask your healthcare provider.
• Call your local or state health department.

Brand name(s)

• PedvaxHIB^®

This report on medications is for your information only, and is not considered individual patient advice. Because of the changing nature of drug information, please consult your physician or pharmacist about specific clinical use.

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Selected Revisions: June 15, 2026.