Definition: A genus of small, often pleomorphic, coccoid to ellipsoidal, nonmotile, gram-negative bacteria (order Rickettsiales) that occur either singly or in compact inclusions in circulating mammalian leukocytes; species are the etiologic agents of ehrlichiosis and are transmitted by ticks. The type species is Ehrlichia canis.
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Examples: glitazone, GI cocktail, etc.