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. 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. Following ingestion of infective eggs, the larvae hatch in the small intestine and the adults establish themselves in the colon, usually in the cecum.

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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. 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. Following ingestion of infective eggs, the larvae hatch in the small intestine and the adults establish themselves in the colon, usually in the cecum.

The time interval from ingestion of infective eggs to oviposition by the adult females is about one month. At full maturity adult females measure 8 to 13 mm, and adult males 2 to 5 mm; the adult life span 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.

Rarely, eggs may become airborne and be inhaled and swallowed. Retroinfection, or the migration of newly hatched larvae from the anal skin back into the rectum, may occur but the frequency with which this happens is unknown. Hosts Oxyurid nematodes pinworms generally exhibit high host specificity. Humans are considered the only host for E. Geographic Distribution E. Clinical Presentation 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, teeth grinding, enuresia, insomnia, anorexia, irritability, and abdominal pain, which can mimic appendicitis.

Very rare instances of eosinophilic colitis associated with E. Page last reviewed: August 5,

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Parasite Oxyuris Vermicularis: Life Cycle, Mode of Transmission and Treatment

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. 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. Following ingestion of infective eggs, the larvae hatch in the small intestine and the adults establish themselves in the colon, usually in the cecum. The time interval from ingestion of infective eggs to oviposition by the adult females is about one month.

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Pinworm (parasite)

Genus — Oxyuris Species — vermicularis Oxyuris vermicularis is a nematode endoparasite, inhabiting the caecum, appendix and other parts of large intestine of man. The parasite is commonly called as thread worm or pin worm or seat worm. The disease caused by this parasite is known as enterobiasis or oxyuriasis. The pin worm has been known since ancient time but was first described by Linnaeus in Leuckart worked out the life cycle of O. Life cycle: It is a monogenetic parasite.

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