A vaccine can prevent Haemophilus influenzae type b (Hib) disease. Before the vaccine, Hib was the most common cause of serious H. influenzae disease. However, the Hib vaccine does not prevent disease caused by the other types of H. influenzae.

CDC recommends Hib vaccine for all children younger than 2 years old in the United States. Babies start getting the Hib vaccine at 2 months old (they need multiple doses for best protection).

Older children and adults usually do not need a Hib vaccine. However, CDC recommends Hib vaccination for people with certain medical conditions. Talk to your or your child’s healthcare professional about what is best for your specific situation. Learn more about Hib vaccination.

View immunization schedules for children and adults.


This photograph showed an infant being held by his mother while receiving an intramuscular vaccination in his left thigh muscle. A qualified nurse was administering the vaccination while stabilizing the injection site.

People can get H. influenzae more than once. Therefore, CDC recommends Hib vaccination for all children younger than 2 years old who had Hib disease. Vaccinating young children gives them the best protection when they are at increased risk for Hib disease.

Preventive Antibiotics

H. influenzae can spread to people who have close or lengthy contact with a person with H. influenzae disease. In certain cases, close contacts of someone with H. influenzae disease should receive antibiotics to prevent them from getting sick. A doctor or local health department will make recommendations for who should receive antibiotics.

Page last reviewed: February 13, 2018