About Haemophilus influenzae Disease

Key points

• Bacteria called Haemophilus influenzae can cause many types of infections.
• Some of these infections are mild, while others are serious.
• Despite its name, H. influenzae doesn't cause the flu.
• Learn about how vaccines can prevent infections from one type of H. influenzae, type b or Hib.

What it is

H. influenzae disease is a name for any infection caused by H. influenzae bacteria.

Types

H. influenzae can cause many different types of infections. These infections range from mild, like ear infections, to serious, like bloodstream infections.

Serious infections

The most common serious infections caused by H. influenzae are:

• Pneumonia (a lung infection)
• Bloodstream infection
• Meningitis (swelling of the lining of the brain and spinal cord)
• Epiglottitis (swelling of the throat)
• Cellulitis (skin infection)
• Infectious arthritis (swelling of a joint)

Mild infections

H. influenzae are a common cause of ear infections in children and bronchitis (chest cold) in adults.

Symptoms

H. influenzae can cause many different types of infections. Symptoms depend on the part of the body that's infected. Serious infections can result in long-term health problems and death.

Keep ReadingSymptoms and Complications

Risk factors

People of **certain ****ages **and racial or ethnic groups are at increased risk for H. influenzae disease. Some medical conditions can also increase someone's risk.

Keep ReadingRisk Factors

Causes

H. influenzae are bacteria that live in people's nose and throat. Usually, these bacteria cause no harm. However, they can move to other parts of the body and cause infection.

Did you know?

There are 6 types of H. influenzae. They are named a through f. The one that most people are familiar with is H. influenzae type b or Hib. Some H. influenzae don't have a type and are called "nontypeable."

Spread to others

People spread H. influenzae to others by coughing or sneezing, which creates small respiratory droplets that contain the bacteria. Other people can get infected if they breathe in those droplets.

People who aren't sick but have the bacteria in their nose and throat can still spread the bacteria. That's how H. influenzae spreads most of the time.

The bacteria can also spread to people who have close or lengthy contact with a person with H. influenzae disease.

Prevention

People can get H. influenzae, including Hib, disease more than once. Maintaining healthy habits helps prevent H. influenzae disease. Examples of healthy habits include washing hands often and not having close contact with people who are sick.

Vaccination

Vaccines can prevent Hib disease, but not disease caused by other H. influenzae. The best way to prevent Hib disease is to get vaccinated. CDC recommends Hib vaccines for all children younger than 5 years old.

Keep ReadingHib Vaccination

Antibiotics

Sometimes close contacts of someone with Hib disease should receive antibiotics to prevent them from getting sick. A healthcare provider or health department generally decides who should get preventive antibiotics.

Testing and diagnosis

Healthcare providers usually diagnose H. influenzae disease with one or more lab tests. The most common testing methods use a sample of blood or spinal fluid.

Treatment and recovery

People diagnosed with H. influenzae disease take **antibiotics **to treat the infection.

People with serious infections may need care in a hospital. Other treatments may include:

• Breathing support
• Medicine to treat low blood pressure
• Wound care for parts of the body with damaged skin

Resources

Hib vaccination: What everyone should know

Parent-friendly vaccination schedules

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