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Legionella pneumophila, the primary causative agent for Legionnaire's disease, is an aerobic, pleomorphic, flagellated, non-spore-forming, Gram-negative bacterium. [ 1 ] [ 2 ] L. pneumophila is a intracellular parasite that preferentially infects soil amoebae and freshwater protozoa for replication.
Legionella is a genus of gram-negative bacteria that can be seen using a silver stain or grown in a special media that contains cysteine, an amino acid.It is known to cause legionellosis [3] (all illnesses caused by Legionella) including a pneumonia-type illness called Legionnaires' disease and a mild flu-like illness called Pontiac fever. [3]
Legionella spp. enter the lungs either by aspiration of contaminated water or inhalation of aerosolized contaminated water or soil. In the lung, the bacteria are consumed by macrophages, a type of white blood cell, inside of which the Legionella bacteria multiply, causing the death of the macrophage. Once the macrophage dies, the bacteria are ...
Legionella sp. under ultraviolet illumination Scientific classification; Domain: Bacteria: Phylum: Pseudomonadota: Class: Gammaproteobacteria: Order: Legionellales: Families and genera Legionellaceae Legionella Coxiellaceae Aquicella Coxiella Diplorickettsia Rickettsiella "Ca. Berkiella" [1] "Ca. Fiscibacter" [1] "Ca.
Legionella species are aquatic organisms and typically inhabit freshwater environments with humans being accidental hosts. Most isolates of Legionella have been from air-conditioning cooling towers and potable-water distribution systems, but they can also be found in other thermally polluted water sources such as air conditioners, spa equipment ...
Legionella pneumophila is the most common cause, but sometimes other species of Legionella bacteria also cause Legionnaires' disease. [ 15 ] [ 16 ] The terms "Philadelphia fever" and "Legion fever" appear to have been used at the time of the outbreak and for shortly thereafter, [ 17 ] although at least one 2008 source which covers disease in a ...
Legionella feeleii is a Gram-negative, rod-shaped bacterium from the genus Legionella which was isolated from an automobile plant and which was held responsible for causing Pontiac fever in 317 workers. [3] [4] The organism did not grow on blood agar, required L-cysteine, and showed significant quantities of branched-chain fatty acids.
The specific strain for Legionella clemsonensis is D5610. [5] It was named in honor of the research group of students from the Clemson’s Creative Inquiry. [1] Legionella clemsonensis was first isolated in 2006 from the bronchial wash of a patient diagnosed with pneumonia. [5] Bronchial washing is part of a bronchoscopy procedure. [5]