Query: NC_007799:257500 Ehrlichia chaffeensis str. Arkansas, complete genome Lineage: Ehrlichia chaffeensis; Ehrlichia; Anaplasmataceae; Rickettsiales; Proteobacteria; Bacteria General Information: This strain is the first isolate of Ehrlichia chaffeensis, which was obtained from a patient on an army base in Arkansas, USA in 1990. Causes disease in humans. This organism is an obligate intracellular pathogen that exists within vacuoles in the cytoplasm of monocytes or granulocytes. Transferred during an insect (tick) bite, it can cause disease in humans (human monocytic ehrlichiosis) and can reside in several other animals and is a problem in immunocompromised patients. The bacterium inhibits phagosome-lysozome fusion as well as programmed cell death (apoptosis) of the host cell, similar to what is observed with Anaplasma phagocytophilum.
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General Information: This strain was isolated in 1989 in North Carolina, USA from a 2-year-old male dog. This organisms causes canine monocytic ehrlichiosis, which is a tick-born disease that causes severe morbidity in domesticated and wild dogs. The brown dog tick, Rhipicephalus sanguineus, transfers the organism from its salivary glands to the animal when feeding. Persistence in the vacuole leads to replication and cell division and eventual release from the cell which leads to further spreading of the bacterium throughout the host. The end result is an increase in platelet count and anemia.