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The disorder is caused by infestation with the roundworms Necator americanus, Ancylostoma duodenale, Ancylostoma ceylanicum, or Ancylostoma braziliense. The first two occur in humans only. The last types also occur in animals.
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Hookworms cause trouble for their human host when the worms attach their mouths to the lining of the small intestine and suck the person's blood. An itchy, slightly raised rash called "ground itch" may appear around the area where the larvae first...
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