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Arboviruses 

Arboviruses
Chapter:
Arboviruses
DOI:
10.1093/med/9780198729228.003.0045
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date: 18 November 2019

Ascariasis is caused by the intestinal nematode Ascaris lumbricoides. Ascariasis is the commonest infection caused by worms in humans and is endemic throughout the world. Children between 2 and 10 years old are the commonest infected group. Asymptomatic infection is the commonest, and the first sign of ascariasis is often excretion of a worm in the faeces. Intestinal symptoms, such as abdominal pain, nausea, or diarrhoea, occasionally occur; other symptoms, such as pulmonary or hepatobiliary symptoms, occur during migration and mainly in patients with a high burden of worms. The presence of A. lumbricoides is usually diagnosed by microscopic examination confirming the presence of eggs in a stool sample. Re-examination 3 weeks after treatment to check eggs and worms are eradicated is advised. First-line treatment in children for ascariasis is mebendazole.

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