DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Hookworm head. Coloured Scanning Electron Micrograph of the head of the parasitic hookworm, Necator americanus. This is one of the commonest causes of hookworm infestation in humans, particularly in warm, moist tropical regions. The worm's head contains several tooth-like structures with which it clings to the bowel of it's host. Hookworms also infect dogs and cats. Human infestation begins with larvae penetrating the skin, usually by burrowing into the feet of a person and entering the bloodstream. The larvae then migrate throughout the body, particularly the small intestine. Magnification: x535 at 6x6cm size. Magnification: x825 at 4x4 inch size.
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