Query: NC_014125:2489949 Legionella pneumophila 2300/99 Alcoy chromosome, complete genome
Lineage: Legionella pneumophila; Legionella; Legionellaceae; Legionellales; Proteobacteria; Bacteria
General Information: This strain (2300/99 Alcoy) belongs to serogroup 1 and is considered endemic in Spanish areas. It was isolated from a patient affected by legionellosis in Alcoy (Spain). One of the most important outbreaks was registered in Murcia (Spain) in 2001, when more than 751 cases of suspected Legionellosis were registered. This organism is a non-marine bacterium usually found growing inside other organisms such as protozoans in aquatic environments. They can also be found in soil, freshwater, and in biofilms. Protozoans may act as bacterial reservoirs.
Subject: NC_002942:675829 Legionella pneumophila subsp. pneumophila str. Philadelphia 1,
Lineage: Legionella pneumophila; Legionella; Legionellaceae; Legionellales; Proteobacteria; Bacteria
General Information: This strain is the isolate from the initial event of Legionellosis in Philadelphia, USA. Causes Legionnaire's disease. This organism is a non-marine bacterium usually found growing inside other organisms such as protozoans in aquatic environments. They can also be found in soil, freshwater, and in biofilms. The cause of the disease was traced to Legionella bacteria. Once the bacteria are brought into the lungs they make contact with alveolar macrophages and are internalized where they can cause severe respiratory distress. Internalization occurs through specialized vacuoles (replicative phagosomes) that allow the bacteria to grow and replicate prior to escape from the macrophage. Formation of the replicative phagosome, which requires reprogramming of the normal phagosome maturation pathway, requires a type IV secretion system called the Dot/Icm system. This type IV system is closely related to the conjugative system of plasmid ColIb-P9, and is involved in the secretion of numerous protein components that aid in formation of the replicative phagosome. Other virulence determinants include a set of multidrug transporters and other efflux pumps for toxic compounds that may allow the organism to persist in its habitat, a set of LPS phase variable genes that enhance immune evasion, and a type II secretion system for transport of hydrolases.