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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 ewingii is a species of Rickettsiales bacteria. It has recently [ when? ] been associated with human infection, and can be detected via PCR serological testing. The name Ehrlichia ewingii was proposed in 1992.
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]
Ehrlichia is a rickettsial genus of bacteria belonging to the family Ehrlichiaceae. There are several species of Ehrlichia, but the one that most commonly affects dogs and causes the most severe clinical signs is Ehrlichia canis. This species infects monocytes in the peripheral blood.