<Tr> <Th_colspan="2"> Binomial name </Th> </Tr> <Tr> <Td_colspan="2"> Treponema pallidum Schaudinn & Hoffmann, 1905 </Td> </Tr> <P> Treponema pallidum is a spirochaete bacterium with subspecies that cause treponemal diseases such as syphilis, bejel, pinta, and yaws . It is a helically coiled microorganism usually 6--15 μm long and 0.1--0.2 μm wide . The treponemes have a cytoplasmic and an outer membrane . Using light microscopy, treponemes are visible only by using dark field illumination . They are Gram negative, but some regard them as too thin to be Gram stained . </P> <Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (December 2010) </Td> </Tr> </Table>

What disease is caused by bacterium treponema pallidum