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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Cjcle pinworm has a worldwide distribution, [22] and is the most common helminth i. The worms have a monogenetic life cycle i. Metazoa Animalia multicellular eukaryotes, animals Nemathelminthes nematodes Secernentea Phasmidea with chemoreceptors known as phasmids Oxyurida pinworms; pointed tails Oxyuroidea eggs attached around anus of host Family: Enterobius vermicularis Enterobiasis Pinworm.

During night time, the vermivularis crawl out of the anus of the human host for egg laying. Pinworms are common in many animal species, and infections in humans may cause intense pruritis itchingirritability, insomnia and sometimes diarrhoea. The female worms are longer than the male.

Alternatively, eggs trapped in perianal folds may hatch and the larvae may enter the intestines directly via the anus process called retro-infection. Numerous pin-worm species have been described from a range of mammals, birds, reptiles, amphibians, insects and millipedes, but they appear to be highly host-specific. As a work of the U. Description Enterobius vermicularis LifeCycle.

National Library of Medicine. The common symptoms of the disease include loss of appetite, itching of anal parts, restlessness, diarrhea, and inflammation of rectum.


These worms form three developmental stages: Recommend on Facebook Tweet Share Compartir. Copulation takes place in human colons. Heavy infections in children may cause restlessness, irritability, anorexia, insomnia, nightmares, bed-wetting, nausea and vomiting.

This article is about the nematode of the family Enterobius, known as pinworm in the US. Lifd Spiruria Camallanida Dracunculus medinensis Dracunculiasis. Occasionally, wandering worms have been associated vermicularix appendicitis, vaginitis, and rarely, extra-intestinal granulomas in ectopic sites. Gravid females migrate nocturnally outside the anus and oviposit while crawling on the skin of the perianal area. Journal of Medical Case Vermiclaris.

American Society for Microbiology. The Journal of Parasitology. Retrieved from ” https: Diphyllobothrium latum Diphyllobothriasis Spirometra erinaceieuropaei Sparganosis Diphyllobothrium mansonoides Sparganosis. January 10, Enterobiius last updated: This micrograph reveals the cephalic alae in the head region of E. The larvae contained inside the eggs develop the eggs become infective in 4 to 6 hours under optimal conditions.

Self-infection occurs by transferring infective eggs to the mouth with hands that have scratched the perianal area.

Pinworm (parasite)

Global Health — Division of Parasitic Diseases. Fasciolopsis buski Fasciolopsiasis Metagonimus yokagawai Metagonimiasis Heterophyes heterophyes Heterophyiasis. Garcia, Lynne Shore Enterobius vermicularis [this species causes perianal pruritis enterobiasis in humans] Parasite morphology: Public domain Public domain false false.

Practical guide to diagnostic parasitology. Motile worms may be seen on perianal skin glistening under bright light when close visual examinations are conducted during the night or early in the morning.

Cook GC September Enterobius vermicularis LifeCycle B.


Life cycle image and information courtesy of DPDx. Infectious diseases Parasitic disease: Patients vigorously scratch themselves attempting to relieve the itching, but in doing so, often cause skin damage, bleeding, bacterial infection and intensified itching.

Alternatively, sticky-tape may be quickly applied to the perianal skin first thing in the morning and then stuck onto a glass slide for microscopic examination of adherent eggs aptly-named perianal sticky-tape test. Village Medical Manual 5th ed. The eggs are dislodged lie host scratching and contaminate hands, bedding, clothing, toys, and furniture.

Enterobius vermicularis life cycle | Information by Catalina… | Flickr

Retrieved 5 December Following ingestion of infective eggs, the larvae hatch in the small intestine and the adults establish themselves in the colon. Following ingestion, the eggs hatch in the small intestine and the larvae migrate to the large intestine and mature over weeks.

Humans are the only natural host of Enterobius vermicularis. They remain viable in cool moist conditions for up to one week. Household decontamination is difficult as infective eggs can survive for many days in cool moist house dust and for a few days on toys or furniture. The eggs are ingested by the same or other hosts with contaminated food and drinks or directly by contaminated vermicjlaris and fingernails. From Wikipedia, the free encyclopedia.