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roundworm, Enterobius vermicularis, worldwide in distribution and the most common source of worm infestation of humans in the United States. Children are more commonly infested than adults. Adult pinworms inhabit and mate in the cecum of the large intestine and adjacent areas. When mature females become gravid they migrate down the colon and out onto the skin around the anus where they lay about 10,000 eggs and then die. Such movements cause intense anal itching. The eggs are infective within a few hours and are easily spread by the hands to the mouth, most often through touching contaminated household objects or food supplies. If infective eggs are swallowed the young worms hatch in the duodenum and migrate to the cecum. Development from ingested egg to gravid female requires 2 months. The most prominent symptom of the disease resulting from pinworm infestation, called enterobiasis, is anal itching, particularly at night; restlessness and insomnia are common, and sometimes gastrointestinal symptoms such as abdominal pain, nausea, and diarrhea, are also present. Since reinfection is a major problem, enterobiasis is treated by the following of strict hygienic measures, including careful cleansing of hands, body, and bed linens. Often, all members of the household must be treated for the disease. Pinworms are classified in the phylum NematodaNematoda
, phylum consisting of about 12,000 known species, and many more predicted species, of worms (commonly known as roundworms or threadworms). Nematodes live in the soil and other terrestrial habitats as well as in freshwater and marine environments; some live on the deep
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, order Oxyuroidea, family Oxyuridae.



(Enterobius vermicularis), a roundworm of the suborder Oxyurata that parasitizes humans. The cuticle forms a swelling, or vesicle, near the head. The mouth is surrounded by three lips and opens into the esophagus, which is enlarged toward the end. The female is 9–12 mm long and has a narrow posterior end. The male measures 2–5 mm in length; the posterior part of the body ends bluntly and is greatly bent. The colorless eggs are about 0.05 mm long.

Pinworms live in the terminal part of the small intestine and throughout the large intestine. Mature females migrate outside the anus and, after depositing their eggs (about 12,000), they die. A person becomes infected by swallowing the eggs. Itching occurs as the pinworm leaves the body and deposits its eggs. Severe infestation may cause nervous and gastrointestinal disorders. A rash may develop near the perineum. Children may experience nightmares, engage in masturbation, and contract leukorrhea. The disease caused by pinworms, enterobiasis, is prolonged because of auto-infection (the life span of a pinworm is about one month).


Vasil’kova, Z. G. Osnovnye gel’mintozy cheloveka i bor’ba s nimi, 2nd ed. Moscow, 1953.



(invertebrate zoology)
Enterobius vermicularis. A phasmid nematode of the superfamily Oxyuroidea; causes enterobiasis. Also known as human threadworm; seatworm.
References in periodicals archive ?
The high prevalence rates of parasitic infection per months in both males and females were as follow: Ascaris lumbricoides in May (0.11 %) and March (0.16 %), Enterobius vermicularis in March (0.04 %) and April (0.02 %), Trichuris trichiura in March (0.06 %) and February (0.13 %), Hymenolepis nana in April (0.06 %) and April (0.03 %), Taenia saginata in October (0.02 %) and March (0.04%), Entamoeba histolytica in November (0.17 %) and February (0.1 %) and Giardia lamblia in April (0.19 %) and February (0.08 %).
A total of 76 (5.17%) showed enterobius vermicularis on histopathological examination while only 4 patients have ascaris infestation.
histolytica/dispar/moshkovskii 38 4L75 Endolimax nana 31 34,06 Giardia lamblia 17 18,68 Iodamoeba butschlii 14 15,38 Chilomastix mesnili 7 7,68 Pentatricomonas hominis 4 4,39 Helmintos Ascaris lumbricoides 35 38,46 Ancylostomideos 29 31,86 Trichuris trichiura 11 12,08 Strongyloides stercoralis 6 6,59 Enterobius vermicularis 2 2,19 Incluye asociaciones parasitarias.
Enterobius vermicularis infection among population of General Mansilla, Argentina.
1 Ascaris lumbricoides Enterobius vermicularis Fasciola hepatica 1 muhtemel vaka Tablo 3.
(Entamoeba histolytica and Entamoeba dispar (7.05%); cysts of both parasites are similar) Giardia lamblia (4.4%) Enterobius vermicularis (3.2%) Hymenolepis nana (5.7%) Taenia species (5.1%) Fasciola species (5.1%) Toxocara species (3.8%) and the least observed parasite was Toxoplasma gondii (1.9%).
dispar 09 6,6 Iodamoeba butschlii 05 3,7 Helmintos Ascaris lumbricoides 13 9,6 Trichuris trichiura 10 7,4 Ancylostomidios 08 5,9 Hymenolepis nana 04 2,9 Strongyloides stercoralis 03 2,2 Enterobius vermicularis 01 0,7 * El nino puede estar infectado por mas de un parasito intestinal, por lo tanto se incluyen las asociaciones parasitarias.
Objetivos Indagar sobre la prevalencia de Enterobius vermicularis en los escolares en edades entre 3 y 14 anos, de la zona rural del municipio de Quipile, Colombia.
La frecuencia de helmintos encontrados en la presente investigacion es similar a la referida por Gonzalez y cols, quienes reportaron a Trichuris trichiura, Ascaris lumbricoides, Hymenolepis nana y Enterobius vermicularis como los helmintos presentes en ninos preescolares y escolares del municipio Mara (21).
Yontemler: Bu yazimizda akut apandisit on tanisiyla ameliyata alinan, sonrasinda patoloji spesmenlerinde Enterobius vermicularis bagirsak parazitine rastlanilan 4 olguyu literaturun gozden gecirilmesi ile inceledik.