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The picture of Treponema pallidum is from the U.S. Navy Environmental Health Center. T. pallidum is a motile spirochete that is closely related to the organisms causing yaws, pinta, and bejel. It is slender and tightly coiled, measuring 5 to 15 µm long by 0.09 to 0.18µm wide. They have a characteristic motility on dark field microscopy. T. pallidum has not been cultured in vivo.