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Treponema (family Spirochaetaceae, order Spirochaetales) A genus of flexible, spirally shaped bacteria which are anaerobic or micro-aerophilic chemo-organotrophs. There are many species, found in the alimentary and reproductive tracts in humans and other animals. Some species are pathogenic, e.g. T. pallidum is the causal agent of syphilis.

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Treponema (trep-ŏ-nee-mă) n. a genus of anaerobic spirochaete bacteria. All species are parasitic; some cause disease, such as T. carateum (pinta), T. pallidum (syphilis), and T. pertenue (yaws).