Query: NC_007799:968499 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 organism is the causative agent of scrub typhus, and like other members of the Rickettsiales is an obligate intracellular organism. Scrub typhus, which occurs in rural and agricultural areas, is one of the most common infectious diseases in southeast Asia where an estimated 1 million cases occur each year. Many cases are mild, but if left untreated, a variety of serious illnesses can arise and fatality rates can range from 1-35%. Transmission occurs via an insect vector through the bite of the larval trombiculid mite (chiggers). The bacterium is transmitted transovarially in mites (from females to their offspring).