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Ancylostoma duodenale is a species of hookworm, a parasitic nematode that infects the small intestine of humans, dogs, and cats. This worm, measuring 8 to 13 mm long, is found globally but is most common in warmer regions.12

The life cycle involves adult worms in the intestine producing eggs passed in feces. If these eggs reach suitable soil, they hatch into larvae that can penetrate human skin, typically on the feet. The larvae travel through the bloodstream to the lungs, are swallowed, and mature in the small intestine, beginning a new cycle.12

Symptoms can include a skin irritation known as "ground itch," and in the intestine, the worms feed on blood, potentially causing anemia. Heavy infestations can lead to fatigue, stunted growth, and other health issues. Prevention focuses on sanitary disposal of human waste and avoiding bare feet in contaminated soil.12

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