Definition

Noun: * A pathogenic bacterium: Legionella pneumophilia is the specific, motile, aerobic, rod-shaped, Gram-negative bacterium that causes Legionnaires' disease. It thrives in warm water environments, such as those found in complex water systems like cooling towers, hot tubs, and large plumbing systems.

Usage Examples

• Noun:
  • The outbreak was traced to Legionella pneumophilia contaminating the hotel's cooling tower.
  • Water treatment is essential to control the growth of Legionella pneumophilia in industrial systems.
  • A laboratory test confirmed the presence of Legionella pneumophilia in the patient's sputum sample.

Advanced Usage

• Scientific/Medical Context: The term is used almost exclusively in technical, medical, and public health contexts. It is the specific etiological agent (cause) of a disease, distinguishing it from other bacteria in the genus.
  • Legionella pneumophilia serogroup 1 is responsible for the majority of Legionnaires' disease cases.

Variants and Related Words

• Legionella (noun): The genus name for a group of bacteria, of which is the most clinically significant species.
• Legionnaires' disease (noun): The severe form of pneumonia caused by infection with .
• Pontiac fever (noun): A milder, flu-like illness also caused by .

Synonyms

• Legionella bacterium (less specific)
• Causative agent of Legionnaires' disease (descriptive)

Related Phrases

• Legionella contamination: The presence of the bacterium in a water system.
• Legionella control: Measures taken to prevent the growth and spread of the bacterium.

Noun

1. the motile aerobic rod-shaped Gram-negative bacterium that thrives in central heating and air conditioning systems and can cause Legionnaires' disease