| Spirochaeta obermeieri | A species causing relapsing fever in South America, Europe, Africa, and Asia; transmitted by the bedbug, Cimex lectularius, and the louse, Pediculus humanus subsp. Humanus. Synonym: Obermeier's spirillum, Spirochaeta obermeieri. (05 Mar 2000) |
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| spirochaeta | A genus of flexible, spiral rods found in hydrogen sulfide-containing mud, sewage, and polluted water. None of the species properly referred to in this genus are pathogenic. (12 Dec 1998) |
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| Spirochaeta plicatilis | A very large species (sometimes as long as 200 um) of bacteria; it is nonparasitic, so far as known; it is the type species of the genus Spirochaeta. (05 Mar 2000) |