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  • Legionella
    Legionella
    noun
    a genus of rod- or coccus-shaped aerobic Gram-negative bacteria, certain species of which, as L. pneumophila, produce legionnaires' disease.
  • legionella
    legionella
    noun
    any Gram-negative rod-shaped bacterium of the genus Legionella, including L. pneumophila, which causes legionnaire's disease

Legionella

American  
[lee-juh-nel-uh] / ˌli dʒəˈnɛl ə /

noun

  1. a genus of rod- or coccus-shaped aerobic Gram-negative bacteria, certain species of which, as L. pneumophila, produce legionnaires' disease.


legionella British  
/ ˌliːdʒəˈnɛlə /

noun

  1. any Gram-negative rod-shaped bacterium of the genus Legionella, including L. pneumophila, which causes legionnaire's disease

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of Legionella

< New Latin (1979), after legionnaires' disease; see -ella

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

“Hot tubs can be a source of Legionella growth and transmission when they are inadequately maintained and operated,” the CDC said.

From Los Angeles Times May 18, 2026

Kaiser Permanente is still trying to determine the source of bacteria responsible for 19 recent cases of Legionella infection identified at a hospital in the San Francisco Bay Area.

From Los Angeles Times May 18, 2026

Other ways facility managers can reduce the risk of Legionella include disinfecting cooling towers and water systems, establishing a water management program and routinely performing water system maintenance.

From Los Angeles Times May 18, 2026

Following her diagnosis, the Greek health ministry issued a statement to hoteliers in Crete to "raise awareness among all those involved in monitoring the quality of water for human consumption especially with regard to Legionella".

From BBC Jun. 21, 2025

That followed problems, including traces of Legionella bacteria being found in the vessel’s on-board water system, days after the first asylum seekers boarded in August 2023.

From BBC Oct. 31, 2024

Legionnaires' disease, caused by the legionella bacteria, can result in a severe form of pneumonia.

From Reuters Sep. 14, 2023

It's important not to set it any lower as it could create a health risk - legionella bacteria could develop in the water.

From BBC Dec. 11, 2022

Lowering the hot water temperature too much can allow the growth of bacteria, including legionella.

From BBC Oct. 3, 2022

Flint's water also contained trihalomethane, a carcinogen, as well as dangerous E. coli and legionella bacteria.

From Salon Nov. 26, 2021

Last year, patients at St. Elizabeths Hospital, the District’s public psychiatric facility, filed a federal lawsuit faulting its response after legionella bacteria, which can cause Legionnaires’ disease, was discovered in the hospital’s water system.

From Washington Post May 26, 2020

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