Pinworm Infection (Enterobius vermicularis) Figure 1 from Pinworm Infection in Red Book® Pinworm Infection (Enterobius vermicularis) Figure 2 from. Pinworm infection, also known as enterobiasis, is a human parasitic disease caused by the . Pinworm life cycle. The cause of a pinworm infection is the worm Enterobius vermicularis. The entire lifecycle — from egg to adult — takes place in. Request PDF on ResearchGate | Enterobius vermicularis (oxiuros) en la práctica ginecológica: clínica y citología. Experiencia de 3 casos | We report three.

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The nematode roundworm Enterobius vermicularis previously Oxyuris vermicularis also called human pinworm. Humans are considered to be the only hosts of E. A second species, Enterobius gregoriihas been described and reported from Europe, Africa, and Asia. For all practical purposes, the morphology, life cycle, clinical presentation, and treatment of E. Eggs are deposited on perianal folds. Self-infection occurs by transferring infective eggs to the mouth with hands that have scratched the perianal area.

Person-to-person transmission can also occur through handling of contaminated clothes or bed linens. 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.

Pinworm infection – Wikipedia

These would be swallowed and follow the same development as ingested eggs. Following ingestion of infective eggs, the larvae hatch in the small intestine and the adults establish themselves vermcularis the colon.

The time interval from ingestion of infective eggs to oviposition by the adult females is about one month. The life span of the adults is about two months. Gravid females migrate nocturnally outside the anus and oviposit while crawling on the skin of the perianal area. The larvae contained inside the eggs develop the eggs become infective in 4 to 6 hours under optimal conditions. Retroinfection, or the vermiculari of newly hatched enterobjus from the anal skin back into the rectum, may occur but the frequency with which this happens is unknown.


Worldwide, with infections more frequent in school- or preschool-children and in crowded conditions. Enterobiasis appears to be more common in temperate than tropical countries. The most common helminthic infection in the United States an estimated 40 million persons infected.

Enterobiasis is frequently asymptomatic. The most typical symptom is perianal pruritus, especially at night, which may lead to excoriations and bacterial superinfection. Occasionally, invasion of the female genital tract with vulvovaginitis and pelvic or peritoneal granulomas can occur. Other symptoms include anorexia, irritability, and abdominal pain.

Adult male of E. The worm measured 1. Close-up of the anterior end of the worm in Figure A. The esophagus, divided into muscular and bulbous portions and separated by a short, narrow isthmus, is visible in the image, as are the cephalic expansions.

Close-up of the posterior end of the worm in Figure A. Note the blunt end. The spicule is withdrawn into the worm in this specimen. Anterior end of an adult female of E.

Cross-section of a male E. Notice the presence of verjicularis alae blue arrowintestine red arrow and testis black arrow. Cross-section of an adult female E. Note the presence of the alae blue arrowintestine green arrow and ovaries black arrows. Cross section of an adult female E.

Note the prominent alae blue arrow and the presence of eggs yellow arrow.

Image contributed by Sheboygan Memorial Hospital, Wisconsin. Longitudinal section of an adult female E. Note the presence of many eggs. Microscopic identification of eggs collected in the perianal area is the method of choice for diagnosing enterobiasis.

Eggs can also be found, but less frequently, in the stool, and occasionally are encountered in the urine or vaginal smears. Adult worms are also diagnostic, when found in the perianal area, or during ano-rectal or vaginal examinations.


Morphologic comparison with other intestinal parasites. Treatment information for enterobiasis can be found at: DPDx is an education resource designed for health professionals and laboratory scientists. For an overview including prevention and control visit www. Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site entetobius. Enter Enterovius Address What’s this? Recommend on Facebook Tweet Share Compartir.

Life Cycle Eggs are deposited on perianal folds. Geographic Distribution Worldwide, with infections more frequent in school- or preschool-children and in crowded conditions.

Image Gallery Enterobius vermicularis eggs.

They are usually partially-embryonated when shed. Eggs will adhere to the tape and can be seen microscopically. Enterobius vermicularis adult worms. Adult males of Enterobius vermicularis measure up to 2. Adult males have a blunt posterior end with a single spicule; females possess a long pointed tail.


In both sexes, there are cephalic expansions. Posterior end of the worm in Figure D. Note the long, slender pointed tail. Laboratory Diagnosis Laboratory Diagnosis Microscopic identification of eggs collected in the perianal area is the method of choice for diagnosing enterobiasis.

Diagnostic Findings More on: Treatment Information Treatment Information Treatment information for enterobiasis can be found at: Get Email Updates To receive email updates about this page, enter your email address: December 8, Page last updated: December 8, Content source: Linking to a non-federal site does not constitute an endorsement by HHS, CDC or any of its employees of the sponsors or the information and products presented on the site.