Haemophilus influenzae, including Hib, is a bacterium that can cause a severe infection, occurring mostly in infants and children younger than five years of age. Adults 65 years and older are also at higher risk. American Indian/Alaska Native populations are also at increased risk for invasive Haemophilus influenzae disease.
People with certain medical conditions are at higher risk for developing a Haemophilus influenzae infection. Those medical conditions include:
- Sickle cell disease
- Asplenia (no spleen)
- HIV (human immunodeficiency virus) infection
- Antibody and complement deficiency syndromes
- Malignant neoplasms (a type of tumor)
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