Johns Hopkins ABX Guide
Legionnaires' Disease
PATHOGENS
- Major human Legionella pathogens:
- Legionella pneumophila serogroup 1, estimated 70-80% of cases
- Legionella micdadei, second most common in U.S.
- Legionella pneumophila other serogroups, 2-6% of cases
- Other Legionella species are seen occasionally (see module for details).
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Last updated: April 16, 2023
Citation
Auwaerter, Paul G. "Legionnaires' Disease." Johns Hopkins ABX Guide, The Johns Hopkins University, 2023. Johns Hopkins Guides, www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540307/5/Legionnaires'_Disease.
Auwaerter PG. Legionnaires' Disease. Johns Hopkins ABX Guide. The Johns Hopkins University; 2023. https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540307/5/Legionnaires'_Disease. Accessed November 4, 2025.
Auwaerter, P. G. (2023). Legionnaires' Disease. In Johns Hopkins ABX Guide. The Johns Hopkins University. https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540307/5/Legionnaires'_Disease
Auwaerter PG. Legionnaires' Disease [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2023. [cited 2025 November 04]. Available from: https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540307/5/Legionnaires'_Disease.
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