Educable mentally handicapped EMH


Ehrlichia A genus of bacteria that includes several well-known species infecting domestic animals. Ehrlichiae are small, gram-negative bacteria that primarily invade white blood cells, the same cells that fight disease by destroying invading microorganisms. Ehrlichiae typically appear as minute, round bacteria ranging from 1 to 3 micrometers in diameter.

The genus is in the same family (Rickettsia) as the bacterium that causes another tick-borne human disease, rocky mountain spotted fever. The species were first reported in dogs in 1935 but were only documented as causes of human disease in 1986.

The genus Ehrlichia is currently classified as a member of the family Rickettsiaceae, in the order Rickettsiales. The genus includes seven recognized species: E. canis, E. chaffeensis, E. equi, E. phagocy-tophila, E. risticii, E. ewingii, and E. sennetsu. A number of other named ehrlichiae, such as E. platys, E. bovis, E. ovina, and E. ondiri, also cause disease in animals. The names of the latter organisms are enclosed in quotation marks because they have not been formally proposed and accepted according to the rules of the international Code of Nomenclature of Bacteria, Bacteriological Code.

E. ewingii is the most recently recognized human pathogen that causes ehrlichiosis, a potentially fatal disease that has been limited to a few patients in Missouri, Oklahoma, and Tennessee, most of whom have had underlying suppressed immune systems.

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