<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>
<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>
what disease is caused by bacterium treponema pallidum
what disease is caused by bacterium treponema pallidum
syphilis bejel pinta yaws
syphilis bejel pinta yaws