Published by on February 28, 2020
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The term “pinworm” refers to Enterobius vermicularis, a tiny, threadlike, white roundworm (formally known as a nematode) that infects the. Learn about pinworms, the facts on how the infection is spread, and the life cycle of how long it lasts in humans. Gravid females move outside the anus during the night and deposit eggs in the perianal area. The larvae in the egg become infective in approximately 4 hours.

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Strongyloides stercoralis Strongyloidiasis Trichostrongylus spp. Retrieved 5 December January 10, Page last updated: This page was last edited on 21 Septemberat The eggs, however, are oviposited around the anus eenterobius where they are subsequently dislodged and ingested by their hosts.

Occasionally, wandering worms have been associated with appendicitis, vaginitis, and rarely, extra-intestinal granulomas in ectopic sites.

File:Enterobius vermicularis LifeCycle.gif

Views View Edit History. As a work of the U. The life span of the adults is about two months.

Pinworms are common in many animal species, and infections in humans may cause intense pruritis itchingirritability, insomnia and sometimes diarrhoea. Parents of infected children should be trained to collect appropriate samples to respect patient rights and privacy especially involving minors and alleviate any shame or embarrassment.

Humans are considered to be the only hosts of E. The common symptoms of the disease include loss of appetite, itching of anal parts, restlessness, diarrhea, and inflammation of rectum. Enterohius vermicularis Oxyuris vermicularis is commonly called human pinworm. Enterobius vermicularis LifeCycle pt-version. Archived from the original PDF on 10 September Infective larvae develop rapidly within the eggs. A second species, Enterobius gregoriihas been described and reported from Europe, Africa, and Asia.


Derivative works of this file: Some small number of eggs may become airborne and inhaled. Global Health — Division of Parasitic Diseases.

Pinworms have direct life-cycles involving the oral ingestion of eggs containing infective larvae. These worms form three developmental stages: The worms have a monogenetic life cycle i. In British usage, however, pinworm refers to Strongyloideswhile Enterobius is called threadworm.

Some small number of eggs may become airborne and inhaled. Manson’s tropical diseases 22nd ed. Nonetheless, clothes, bed linen and towels should be laundered in hot water, dusty areas should be well vacuumed and potentially contaminated surfaces should be cleaned.

Enterobiinae parasitising the critically endangered orang-utan, according to the characterisation of molecular genomic and mitochondrial markers”. Views Read Edit View history. Oxyuridaecollected from chimpanzees, Pan troglodytes, on Rubondo Island, Tanzania”.

CDC – Enterobiasis – Biology

The egg shell is digested in the duodenum of the host and the larvae are released. Enterobius vermicularis Linnaeus[1] Enterobius anthropopitheci Gedoelst, [1] Enterobius gregorii Hugot, disputed [2] [3] [4]. The female worms are longer than the male. They remain viable in cool moist conditions for up to one week. Mikrobiologie Usage on en. Adult worms attach to the mucosa and feed on intestinal content, bacteria and possibly epithelial cells, causing minute ulcerations which may lead to mild catarrhal inflammation with diarrhoea, eosinophilia and bacterial infection.


Following ingestion of infective eggs, the larvae hatch in the small intestine International Journal of Dermatology. The parasite may complete its whole life-cycle in weeks, and infections may become progressively heavier due to continual parasite uptake through auto-infection, re-infection and retro-infection.

The eggs are dislodged by host scratching and contaminate hands, bedding, clothing, toys, and furniture. Eggs are deposited on perianal folds. Enterobius vermicularis LifeCycle gl. Worm eggs are rarely found in faeces so conventional coprological examination techniques are not used. Adult worms may sometimes be observed on the surface of fresh stool samples. Self-infection occurs by transferring infective eggs to the mouth with hands that have scratched the peria.

This article is about the organism. Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content. Retrieved from ” https: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top.