JACKIE LEWIN, EM UNIT, ROYAL FREE HOSPITAL / SCIENCE PHOTO LIBRARY JACKIE LEWIN, EM UNIT, ROYAL FREE HOSPITAL / SCIENCE PHOTO LIBRARY
Treponema sp. Colour scanning electron micrograph of a colony of bacteria Treponema sp. (blue), attached to the epithelial surface of the human duodenum (pink). Epithelial cell surfaces appear noduled. These elongated spiral-shaped bacteria (spirochaetes) lack rigid cell walls. Pathogenic species of Treponema include T.pallidum which causes syphilis; T. carateum which causes the skin disease "pinta" in tropical America; T. pertenue which causes yaws in Africa. In syphilis, the bacteria may be found on the duodenum, as seen here, as well as in most other parts of the body. Magnification: x7,600 at 6x7cm size.
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