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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Eggs are deposited on perianal folds.
File:Enterobius vermicularis – Wikimedia Commons
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 vermicu,aris 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.
What Are Pinworms?
Following ingestion of infective eggs, the larvae hatch in the small intestine 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.
CDC – Enterobiasis – Biology
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. Derivative works of this file: Enterobius vermicularis LifeCycle B.
Enterobius vermicularis LifeCycle pt-version. From Wikimedia Commons, the free media repository. Description Enterobius vermicularis LifeCycle. As a work of the U. Self-infection occurs by transferring infective eggs to the mouth with hands that have scratched the peria.
The following 3 pages uses this file: Enterobius vermicularis Parasitic roundworms File: Enterobius vermicularis LifeCycle gl. The following other wikis use this file: Mikrobiologie Usage on en. Retrieved from ” https: Enterobius vermicularis life cycle CDC lifecycles.