ENTEROBIUS VERMICULARIS LIFE CYCLE PDF

Another putative pinworm species, Enterobius gregorii , has been described and reported from humans in Europe, Africa, and Asia. However, further morphologic and molecular evidence suggests E. The rat pinworm, Syphacia obvelata , has also very rarely been reported infecting humans. Gravid adult female Enterobius vermicularis deposit eggs on perianal folds. Infection occurs via self-inoculation transferring eggs to the mouth with hands that have scratched the perianal area or through exposure to eggs in the environment e.

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The pinworm species Enterobius vermicularis , also known as threadworm in the United Kingdom and Australia or seatworm , is a parasitic worm. It is a nematode roundworm and a common intestinal parasite or helminth , especially in humans. Other than human, Enterobius vermicularis were reported from bonnet macaque.

Enterobius vermicularis is common in human children and transmitted via the faecal-oral route. Humans are the only natural host of Enterobius vermicularis. In British usage, however, pinworm refers to Strongyloides , while Enterobius is called threadworm.

The pinworm genus Enterobius is a type of roundworm nematode , and three species of pinworm have been identified with certainty. Eggs may contain a developing embryo or a fully developed pinworm larva. Pinworms are sometimes diagnosed incidentally by pathology. Egg under a light microscope. Pinworm eggs are easily seen under a microscope. This micrograph reveals the cephalic alae in the head region of E.

The entire life cycle, from egg to adult, takes place in the human gastrointestinal tract of a single host, [18] [19] from about 2—4 weeks [20] or about 4—8 weeks. The life cycle begins with eggs being ingested. Almost the entire body of a gravid female becomes filled with eggs. The pinworm has a worldwide distribution, [24] and is the most common helminth i.

A fossilized nematode egg was detected in million-year-old fossil dung, [28] showing that parasitic pinworms already infested pre-mammalian cynodonts. The earliest known instance of the pinworms associated with humans is evidenced by pinworm eggs found in human coprolites carbon dated to BC found in western Utah. From Wikipedia, the free encyclopedia. This article is about the organism. For the infection, see Pinworm infection.

This article is about the nematode of the family Enterobius, known as pinworm in the US. For the different nematode known as pinworm in the rest of the world, see Strongyloides stercoralis.

Main article: Enterobiasis. NCBI taxonomy. Retrieved 28 February Zoos' Print Journal. Zoo Outreach Organization. Retrieved 20 October Parasitology Research. Journal of Medical Case Reports. Retrieved 20 August December The Journal of Parasitology. Retrieved 8 April Merriam-Webster's Medical Dictionary.

Archived from the original PDF on 10 September NCBI taxonomy database. National Center for Biotechnology Information, U. National Library of Medicine. Archived from the original on 27 November Hugot JP Diagnostic pathology of parasitic infections with clinical correlations PDF Second ed.

Oxford University Press. Retrieved 21 August Manson's tropical diseases 22nd ed. Saunders Elsevier. Retrieved 18 November World Health Organization. Retrieved 5 December Cook GC September Garcia, Lynne Shore Practical guide to diagnostic parasitology. American Society for Microbiology. International Journal of Dermatology. Caldwell JP February Canadian Family Physician. Vanderkooi M Village Medical Manual 5th ed.

Infectious diseases Parasitic disease : helminthiases B65—B83 — Fasciolopsis buski Fasciolopsiasis Metagonimus yokagawai Metagonimiasis Heterophyes heterophyes Heterophyiasis. Diphyllobothrium latum Diphyllobothriasis Spirometra erinaceieuropaei Sparganosis Diphyllobothrium mansonoides Sparganosis. Dracunculus medinensis Dracunculiasis. Strongyloides stercoralis Strongyloidiasis Trichostrongylus spp.

Trichostrongyliasis Halicephalobus gingivalis. Enterobius vermicularis Enterobiasis Pinworm. Categories : Oxyurida Parasitic nematodes of humans Parasitic nematodes of mammals Parasites of equines Parasites of primates Colorectal surgery. Namespaces Article Talk. Views Read Edit View history. In other projects Wikimedia Commons Wikispecies. By using this site, you agree to the Terms of Use and Privacy Policy. Enterobius vermicularis.

Enterobius anthropopitheci Gedoelst, [1] chimpanzee pinworm [2] Enterobius atelis Cameron, [3] Enterobius brevicauda Sandosham, [3] Enterobius buckleyi Sandosham, [3] [2] Enterobius callithricis Solomon, [3] Enterobius duplicidens Buckley, [3] Enterobius emodensis [2] Enterobius foecunda Linstow, [3] Enterobius gregorii Hugot, disputed [4] [5] [6] [3] Enterobius inglisi [3] Enterobius interlabiata Sandosham, [3] Enterobius lagothricis Buckley, [3] Enterobius lemuris Baehr, [3] Enterobius lerouxi Sandosham, [3] Enterobius macaci [2] Enterobius magnispicula [3] Enterobius paraguerezae [3] Enterobius parallela Linstow, [3] Enterobius pesteri [3] Enterobius pitheci Cameron, [3] Enterobius polyoon Linstow, [3] Enterobius pygatrichus [3] Enterobius schaefferae [3] Enterobius shriveri [3] [2] Enterobius vermicularis Linnaeus , [1] human pinworm [2] [3] Enterobius yagoi Sutton, [3].

Secernentea Spiruria Camallanida Dracunculus medinensis Dracunculiasis.

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What Are Pinworms?

Enterobiasis may also be acquired through surfaces in the environment that are contaminated with pinworm eggs e. Some small number of eggs may become airborne and inhaled. These would be swallowed and follow the same development as ingested eggs. Following ingestion of infective eggs, the larvae hatch in the small intestine The life span of the adults is about two months.

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File:Enterobius vermicularis LifeCycle.gif

NCBI Bookshelf. Prashanth Rawla ; Sandeep Sharma. Authors Prashanth Rawla 1 ; Sandeep Sharma 2. Humans are the only natural host for this infection.

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