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Life cycle Ascaris lumbricoides (Round worm)

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Life cycle Ascaris lumbricoides (Round worm)

Post  sudheerkher on Sun Dec 07, 2008 12:10 am


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Life Cycle of Ascaris Lumbricoides

Post  Barnie on Fri Feb 13, 2009 9:38 pm

Causal Agent:
Ascaris lumbricoides is the largest nematode (roundworm) parasitizing the human intestine. (Adult females: 20 to 35 cm; adult male: 15 to 30 cm.)

Life Cycle:



Adult worms live in the lumen of the small intestine. A female may produce approximately 200,000 eggs per day, which are passed with the feces . Unfertilized eggs may be ingested but are not infective. Fertile eggs embryonate and become infective after 18 days to several weeks , depending on the environmental conditions (optimum: moist, warm, shaded soil). After infective eggs are swallowed , the larvae hatch , invade the intestinal mucosa, and are carried via the portal, then systemic circulation to the lungs . The larvae mature further in the lungs (10 to 14 days), penetrate the alveolar walls, ascend the bronchial tree to the throat, and are swallowed . Upon reaching the small intestine, they develop into adult worms . Between 2 and 3 months are required from ingestion of the infective eggs to oviposition by the adult female. Adult worms can live 1 to 2 years.

Geographic Distribution:
The most common human helminthic infection. Worldwide distribution. Highest prevalence in tropical and subtropical regions, and areas with inadequate sanitation. Occurs in rural areas of the southeastern United States.

Barnie
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Life Cycle, image

Post  Barnie on Fri Feb 13, 2009 9:39 pm


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Re: Life cycle Ascaris lumbricoides (Round worm)

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