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What is pinworm infection?
Pinworm infection is caused by the helminth (Enterobius vermicularis), a small, white parasitic worm. The pinworm is about the length of a staple (ranges from 2 to 13 mm [0.08 to 0.5 inches]) and lives for the most part in the rectum of humans. While an infected person is asleep, female pinworms exit the intestines through the anus and deposit eggs on the skin around the anus. Within a few hours of being deposited on the skin around the anus, pinworm eggs become infectious (capable of infecting another person). Pinworm eggs can survive up to three weeks on clothing, bedding, or other objects if the environment is sufficiently moist.