Ascaris lumbricoides is a type of nematode. It causes Ascariasis, the most frequently occurring parasitic infection. A person becomes infected when they swallow eggs from the roundworm. The fertile eggs hatch into larvae. The Ascaris lumbricoides larvae pass through the intestinal wall, infecting the mucosa. Circulation carries the larvae to the lungs where they mature. During the 10-14 days spent in the lungs, the larvae invade the alveolar walls and bronchial tree and travel into the throat. The larvae travel back into the small intestine when you swallow. Larvae reach maturity in the small intestine, where they live for one to two years.
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