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Treponema bacteria in duodenum

Treponema bacteria in duodenum

B220/0775

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Credit

JACKIE LEWIN, EM UNIT, ROYAL FREE HOSPITAL / SCIENCE PHOTO LIBRARY JACKIE LEWIN, EM UNIT, ROYAL FREE HOSPITAL / SCIENCE PHOTO LIBRARY

Caption

Treponema sp. Transmission electron micrograph of sectioned Treponema sp. bacteria (dark grey) attached to the epithelial surface of the human duodenum. Epithelial cell cytoplasm is seen at bottom. These spiral-shaped bacteria (spiro- chaetes) lack rigid cell walls. Pathogenic species of Treponema include T. pallidum which causes syphilis; T. carateum which causes the skin disease "pinta" common in tropical America: T. pertenue which causes yaws in Africa. In syphilis, the bacteria may be found on the duodenum of the intestine, as well as in most other parts of the body. Magnification: x58,000 at 8x6 inch size.

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