Query: NC_017044:278500 Rickettsia parkeri str. Portsmouth chromosome, complete genome Lineage: Rickettsia parkeri; Rickettsia; Rickettsiaceae; Rickettsiales; Proteobacteria; Bacteria General Information: Animal pathogen in Mammalia (intracellular obligate). Rickettsiae are obligate intracellular Gram-negative bacteria mostly found in arthropods, some of which cause mild to severe diseases in humans. Rickettsia parkeri, a member of the spotted fever group Rickettsia (SFGR), was first isolated from the Gulf Coast tick, Amblyomma maculatum, in 1937. In 2004, the first confirmed human infection with R. parkeri was reported in a 40-year-old man from the Tidewater area of coastal Virginia. The agent was isolated in cell culture from an eschar biopsy specimen and designated the Portsmouth strain; recently, the first recognized case of tick bite-associated human infection was described.
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General Information: This strain was recovered from an acutely infected cow from Northern Idaho, USA and bears an msp1a genotype of JBB. This strain is transmitted by ticks and is known to be virulent. This organism is the causative agent of bovine anaplasmosis and is an obligate intracellular pathogen. Transmission occurs via an arthropod vector (tick) and is a major problem in tropical regions where it causes severe morbidity in cattle populations. The bacterium lives intracellularly within membrane-bound vesicles in the host erythrocyte, a cell type which it specifically targets, resulting in severe anemia for the host organism.