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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.
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 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.
Eggs are deposited from human feces to soil where, after two to three weeks, they become embryonated and enter the "infective" stage. These embryonated infective eggs are ingested by hand-mouth or through fomites and hatch in the human small intestine , exploiting the intestinal microflora as a stimulus to hatching. [ 4 ]
Colonoscopy is a useful diagnostic tool, especially in patients infected with only a few male worms and with no eggs presenting in the stool sample. [19] Trichuriasis can be diagnosed when T. trichiura eggs are detected in stool examination. Eggs will appear barrel-shaped and unembryonated, having bipolar plugs and a smooth shell. [20]
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 ...
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.
Related: Worm Eggs Found in Man's Brain After He Complained of Migraines — and Undercooked Bacon Is to Blame. ... Cysticercosis is often spread by contact with tapeworm-infected human feces ...