What is Haemophilus influenzae in children?

Haemophilus influenzae (H. influenzae) is a group of bacteria that can cause different types of infections in babies and children. H. influenzae most often cause ear, eye, or sinus infections. They also cause pneumonia.

A strain of the bacteria that causes more serious disease is called H. influenzae type b (Hib). The type b strain is now rare in the U.S. because of the Hib vaccine. Before widespread vaccination, significant disease occurred in as many as 130 out of 100,000 kids. That rate is now less than 1 out of 100,000 children. The type b strain caused many cases of infection of the membranes that surround the brain (meningitis). It also caused a life-threatening infection called epiglottitis. This is infection of the part of the throat that covers and protects the voice box (larynx) and windpipe (trachea) while swallowing. In rare cases, a child may still get an Hib infection. This is more likely to occur in a child who hasn't finished the series of vaccines. Or it can occur in an older child who didn't get the vaccine as a baby. Children who travel to other countries may also be at risk. This is because not all children around the world get the Hib vaccine. Most cases of H. influenzae that occur today are due to the non-type b strains of the bacteria.

What causes H. influenzae in a child?

The H. influenzae bacteria live in the nose, sinuses, and throat. They are often spread by close contact with an infected person. Droplets in the air from a sneeze or cough can be breathed in. These may also cause infection.

What are the symptoms of H. influenzae in a child?

Symptoms can be a bit different for each child. Below are the most common symptoms.

How is H. influenzae diagnosed in a child?

The healthcare provider will ask about your child’s symptoms and health history. They will give your child a physical exam. Your child may also have tests, such as:

• Testing of a small sample of fluid from the eye, ear, blood, or spinal canal to check for signs of the bacteria

• Blood tests to check for signs of the bacteria

• Chest or neck X-ray

How is H. influenzae treated in a child?

Antibiotics are used to treat infections caused by H. influenzae. The length of treatment varies depending on where the infection is and how serious it is. Other treatment is done to ease symptoms. Talk with your child’s healthcare provider about the risks, benefits, and possible side effects of all medicines.

How can I help prevent H. influenzae in my child?

Vaccines against H. influenzae type b are routinely given in a 3- or 4-part series. The vaccine is often called the Hib vaccine. The first doses are given at ages 2 and 4 months or at ages 2 months, 4 months, and 6 months. A booster is then given between ages 12 and 15 months. If a child at average risk hasn't had the vaccine and is older than 5 years, they do not need to be vaccinated. The vaccine may be recommended for older children with conditions that put them at higher risk, such as:   

• Sickle cell disease

• No spleen (asplenia)

• A weak immune system from cancer or following a bone marrow transplant

• HIV

When should I call my child’s healthcare provider?

Call the healthcare provider if your child has:

• Symptoms that don’t get better, or get worse

• New symptoms

Key points about H. influenzae in children

• Haemophilus influenzae (H. influenzae) is a group of bacteria that can cause different types of infections in babies and children.

• H. influenzae most often cause ear, eye, or sinus infections. They also cause pneumonia.

• A more serious strain of the bacteria, called H. influenzae type b (Hib), is rare in the U.S. because of the Hib vaccine.

• The H. influenzae bacteria are often spread by close contact with an infected person. Droplets in the air from a sneeze or cough can be breathed in and may also cause infection.

• Antibiotics are used to treat infections caused by H. influenza.

• Vaccines against Hib are routinely given to children.

Next steps

Tips to help you get the most from a visit to your child’s healthcare provider:

• Know the reason for the visit and what you want to happen.

• Before your visit, write down questions you want answered.

• At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also write down any new instructions your provider gives you for your child.

• Know why a new medicine or treatment is prescribed and how it will help your child. Also know what the side effects are and when they should be reported.

• Ask if your child’s condition can be treated in other ways.

• Know why a test or procedure is recommended and what the results could mean.

• Know what to expect if your child does not take the medicine or have the test or procedure.

• If your child has a follow-up appointment, write down the date, time, and purpose for that visit.

• Know how you can contact your child’s provider after office hours, and on weekends and holidays. This is important if your child becomes ill and you have questions or need advice.