Influenza epidemiology and demographics

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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]

Epidemiology and Demographics

Age

• Influenza viruses cause disease among persons in all age groups.
• Rates of infection are highest among children, but the risks for complications, hospitalizations, and deaths from influenza are higher among persons aged 65 years and older, young children, and persons of any age who have medical conditions that place them at increased risk for complications from influenza.
• During 1990--1999, estimated average rates of influenza-associated pulmonary and circulatory deaths per 100,000 persons were:

• 0.4-0.6 among persons aged 0-49 years
• 7.5 among persons aged 50-64 years
• 98.3 among persons aged 65 years and older.