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wood prints treponema pallidum wood prints treponema wood prints pallidum wood prints syphilis wood prints bacterial organism wood prints spirochete wood prints scanning electron micrograph wood prints sem wood prints sems wood prints micrograph wood prints micrographs wood prints electron micrograph wood prints electron micrographs wood prints pathogen wood prints pathology wood prints

photographs treponema pallidum photos treponema photos pallidum photos syphilis photos bacterial organism photos spirochete photos scanning electron micrograph photos sem photos sems photos micrograph photos micrographs photos electron micrograph photos electron micrographs photos pathogen photos pathology photos

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Scanning Electron Micrograph of Treponema pallidum on cultures of cotton-tail rabbit epithelium cells. The cause of syphilis, this microscopic bacterial organism is called a spirochete, a worm-like spiral-shaped organism that wiggles vigorously when viewed under a microscope. Treponema pallidum was discovered in 1905 by the German bacteriologist Fritz Schaudinn (1871-1906) who named it, putting together the Greek trepo (I turn) and nema (thread) with the Latin pallida (pale) to make a pale turning thread. In the United States, over 35,600 cases of syphilis were reported by health officials in 1999.