Community-acquired versus nosocomial Legionella pneumonia: Lessons learned from an epidemiologic investigation

Epidemiologically, the peak incidence of legionella community-acquired pneumonia (CAP) is in the summer/fall, but cases may occur anytime during the year. The peak age incidence of Legionnaire’s disease is in the elderly population, but Legionella CAP occurs in all age groups. The incubation period for Legionnaire’s disease is 2 to 10 days. Typically, legionella CAP occurs sporadically. Clinical presentation of Legionnaire’s disease is independent of legionella species and Legionella nosocomial pneumonia (NP) is indistinguishable clinically from legionella CAP. (Source: American Journal of Infection Control)

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