Legionnaires' bacillus
noun
Le·gion·naires' bacillus
ˌlē-jə-ˈna(ə)rz-, -ˈne(ə)rz- 
: a bacterium of the genus Legionella (L. pneumophila) that causes Legionnaires' disease
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“Legionnaires' bacillus.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Legionnaires%27%20bacillus. Accessed 21 Dec. 2024.
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