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The estimations of the number of eggs in a gravid female pinworm ranges from about 11,000 [12] to 16,000. [18] The egg-laying process begins approximately five weeks after initial ingestion of pinworm eggs by the human host. [12] The gravid female pinworms migrate through the colon towards the rectum at a rate of 12 to 14 centimetres per hour. [12]
The pinworm (species Enterobius vermicularis), also known as threadworm (in the United Kingdom, Australia and New Zealand) or seatworm, is a parasitic worm.It is a nematode (roundworm) and a common intestinal parasite or helminth, especially in humans. [7]
The entire process from skin penetration to adult development takes about 5–9 weeks. The female adult worms release eggs (N. americanus about 9,000–10,000 eggs/day and A. duodenale 25,000–30,000 eggs/day), which are passed in the feces of the human host. These eggs hatch in the environment within several days and the cycle starts anew.
Generally, thousands or even hundreds of thousands of eggs are produced each time the female worm deposits its eggs - a process called oviposition. There is a large variation in the number of eggs produced by different species of worm at one time; it varies in the range of 3,000 to 700,000.
The worms mate inside the host, in which the females also lay their eggs, to be passed out in the host's feces into the environment to start the cycle again. N. americanus can lay between nine and ten thousand eggs per day, and A. duodenale between twenty-five and thirty thousand per day.
People are infected with the parasite after swallowing eggs found in the feces of a person who has an intestinal tapeworm, according to the US Centers for Disease Control and Prevention (CDC).
An Australian woman had a worm in her brain removed by doctors after eating Warrigal greens. Ophidascaris robertsi parasite is usually found in carpet pythons. Woman's series of odd symptoms were ...
Eggs released by adult females are shed in feces. Unfertilized eggs are often observed in fecal samples but never become infective. Fertilized eggs embryonate and become infectious after 18 days to several weeks in soil, depending on the environmental conditions (optimum: moist, warm, shaded soil). [5] Infection occurs when a human swallows ...