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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 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 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 ...
The legionella bacteria responsible for the disease lives and multiplies in water areas like hot tubs, air conditioners, mist sprayers in grocery store produce departments, and water systems.
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.
After being stained with Sudan B, many of the cells did not have fat deposits. Gas-liquid chromatography-mass spectrometry show that all known species of Legionella contain large amounts of branched-chain fatty acids. [8] DNA that was unlabeled from BL-540 was tested against labeled DNAs from the six recognized Legionella species.
Man-made water sources “become a health problem when small droplets of water that contain the bacteria get into the air and people breathe them in,” the CDC said in a fact-sheet. The majority ...
These include the Chlamydiaceae, Legionella and the Mycoplasmataceae (including mycoplasma and ureaplasma); the Spirochetes and Rickettsiaceae are also often considered atypical. [ 1 ] Gram-positive bacteria have a thick peptidoglycan layer in their cell wall, which retains the crystal violet during Gram staining, resulting in a purple color.