Influenza risk factors

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Alejandro Lemor, M.D. [2]

Risk Factors

Persons at higher risk for severe influenza and complications
Children aged younger than 2 years
Adults aged 65 years and older
Asthmatic patients
Blood disorders (such as sickle cell disease)
Kidney disorders
Liver disorders
Heart disease, such as: Congenital heart disease Congestive heart failure Coronary artery disease
Metabolic disorders (such as inherited metabolic disorders and mitochondrial disorders)
Pregnant women
Persons with immunosuppression, including that caused by medications, cancer or by HIV infection
Neurologic and neurodevelopment conditions (including disorders of the brain, spinal cord, peripheral nerve, and muscle such as cerebral palsy, epilepsy, stroke, intellectual disability [mental retardation], moderate to severe developmental delay, muscular dystrophy, or spinal cord injury)
Persons aged younger than 19 years who are receiving long-term aspirin therapy
American Indians/Alaska Natives
Persons who are morbidly obese (BMI > 40)
Residents of nursing homes and other chronic-care facilities.