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threadworm
nematode, Strongyloides stercoralis
Also known as: Strongyloides stercoralis
threadworm, (Strongyloides stercoralis), worm of the phylum Nematoda that is parasitic in the human intestine but is able to live freely and breed in the soil. It is especially common in the moist tropics.
Larvae are passed out of the hostās body in the feces. They usually reenter through the skin of the hostās feet and are carried by the bloodstream to the region of the lungs. They break through the tracheal passages, migrate into the digestive tract, and become localized in the large intestine, maturing and producing eggs there.
The name threadworm is sometimes also applied to other threadlike nematodes, including the species known as the pinworm (q.v.).
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This article was most recently revised and updated by John P. Rafferty.
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