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Gut and tissue nematode infections acquired by ingestion 

Gut and tissue nematode infections acquired by ingestion
Gut and tissue nematode infections acquired by ingestion

Peter L. Chiodini

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date: 05 March 2021

Ascaris lumbricoides (the human roundworm) is widespread in the tropics and subtropics where sanitation is poor and the soil is contaminated with its eggs. Ascaris suum (the pig roundworm) is also capable of infecting humans. Some authorities consider them to be the same species, making A. suum a synonym of A. lumbricoides. Ingested eggs hatch in the small bowel, the larvae released migrate via the bloodstream and lungs, then return to the small bowel and develop into adult worms 15–30 cm long. Most infections are asymptomatic, but there may be pulmonary infiltrates with eosinophilia, abdominal discomfort and—in children with heavy infections—intestinal obstruction. Infection is diagnosed by finding eggs in the faeces. Treatment is with mebendazole, albendazole, or pyrantel pamoate.

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