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Medical Definition of Haemobartonella
1. A genus of parasitic bacteria (order Rickettsiales) found in and on the surface of erythrocytes, but which rarely produce disease in animals without splenectomy. They are identical to Eperythrozoon species, except that Haemobartonella species are not found free in the plasma nor are ring forms seen on the surface of infected erythrocytes. Species are found in laboratory rats and in dogs, cats, and other domestic animals. The type species is Haemobartonella muris. Synonym: Haemobartonella. Origin: G. Haima, blood, + dim. Of A.S. Beretun, courtyard, grange, fr. Bere, barley, + tun, enclosure (05 Mar 2000)