H. influenzae, including Hib, disease occurs mostly in children younger than 5 years old and adults 65 years or older. American Indian people, Alaska Native people, and people with certain medical conditions are also at increased risk. Those medical conditions include:
- Sickle cell disease
- Asplenia (no spleen)
- HIV infection
- Antibody and complement deficiency syndromes (rare conditions that affect the body’s ability to fight infections)
- Cancer requiring treatment with chemotherapy, radiation therapy, or bone marrow stem cell transplant
Haemophilus influenzae is a reportable disease in Oklahoma.