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Ehrlichia chaffeensis is an obligate intracellular, [1] Gram-negative species of Rickettsiales bacteria. [2] It is a zoonotic pathogen transmitted to humans by the lone star tick (Amblyomma americanum). [3] It is the causative agent of human monocytic ehrlichiosis. [4]
Human monocytotropic ehrlichiosis [1] is a form of ehrlichiosis associated with Ehrlichia chaffeensis. [2] This bacterium is an obligate intracellular pathogen affecting monocytes and macrophages. [3]
Ehrlichiosis is a tick-borne [3] bacterial infection, [4] caused by bacteria of the family Anaplasmataceae, genera Ehrlichia and Anaplasma. These obligate intracellular bacteria infect and kill white blood cells. The average reported annual incidence is on the order of 2.3 cases per million people. [5]
Ehrlichiosis ewingii infection [1] is an infectious disease caused by an intracellular bacteria, Ehrlichia ewingii. [2] The infection is transmitted to humans by the tick, Amblyomma americanum. This tick can also transmit Ehrlichia chaffeensis, the bacteria that causes human monocytic ehrlichiosis (HME).
Ehrlichia canis is a small, obligate-intracellular, tick-transmitted, Gram-negative α-proteobacterium. This species is responsible for the globally distributed canine monocytic ehrlichiosis . E. canis also shows evolution in its complex membrane structures and immune evasion strategies.
Clinically, HGA is essentially indistinguishable from human monocytic ehrlichiosis, the infection caused by Ehrlichia chaffeensis, and other tick-borne illnesses such as Lyme disease may be suspected. [15] As Ehrlichia serologies can be negative in the acute period, PCR is very useful for diagnosis. [16]
No rapid laboratory tests are available to diagnose rickettsial diseases early in the course of illness, and serologic assays usually take 10–12 days to become positive. Research is indicating that swabs of eschars may be used for molecular detection of rickettsial infections.
Rickettsia rickettsii is a Gram-negative, intracellular, cocco-bacillus bacterium that was first discovered in 1902. [1] Having a reduced genome, the bacterium harvests nutrients from its host cell to carry out respiration, making it an organo-heterotroph.