Query: NC_008011:663958 Lawsonia intracellularis PHE/MN1-00, complete genome Lineage: Lawsonia intracellularis; Lawsonia; Desulfovibrionaceae; Desulfovibrionales; Proteobacteria; Bacteria General Information: Lawsonia intracellularis PHE/MN1-00 was isolated from intestinal mucosal lesions in pigs that had proliferative enteropathy (PE). When introduced into health pigs, this organism produced the clinical and histological signs of PE. Causative agent for proliferative enteropathy in swine. This organism causes proliferative enteropathy (ileitis) in swine and other domesticated animals resulting in severe losses each year. This obligate intracellular pathogen infects the mucosa of the lower intestinal tract by initially infecting crypt cells, which are precursors that normally grow and divide in order to replace the epithelial cells. Once infection occurs, the crypt cells are stimulated to grow and divide abnormally, resulting in the proliferative phenotype. In severe cases of the disease the entire bowel can become affected and persist for up to 40 days, greatly affecting the host animal.
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General Information: This strain was isolated in 1984 from a patient in Beijing, China. It is similar to pathogenic Escherichia coli except for the more numerous insertion sequences and contains a virulence plasmid (pCP301). Causes enteric disease. Shigella This genus is named for the Japanese scientist (Shiga) who discovered them in the 1890s. They are closely related to the Escherichia group, and may be considered the same species. are human-specific pathogens that are transmitted via contaminated food and water and are the leading causes of endemic bacillary dysentery, and over 1 million deaths worldwide are attributed to them. The bacteria infect the epithelial lining of the colon, causing acute inflammation by entering the host cell cytoplasm and spreading intercellularly. are extremely virulent organisms that require very few cells in order to cause disease. Both the type III secretion system, which delivers effector molecules into the host cell, and some of the translocated effectors such as the invasion plasmid antigens (Ipas), are encoded on the plasmid. The bacterium produces a surface protein that localizes to one pole of the cell (IcsA) which binds to and promotes actin polymerization, resulting in movement of the bacterium through the cell cytoplasm, and eventually to neighboring cells, which results in inflammatory destruction of the mucosal lining. This organism, along with Shigella sonnei, is the major cause of shigellosis in industrialized countries and is responsible for endemic infections.