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Enterobiasis [Enterobius vermicularis]

Life cycle of Enterobius vermicularis

1: Eggs are deposited on perianal folds.
2: Self-infection occurs by transferring infective eggs to the mouth with hands that have scratched the perianal area.
3: 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.g., curtains, carpeting). 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...
4: and the adults establish themselves in the colon.
5: 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.

1: 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.
来源 http://www.dpd.cdc.gov/dpdx/images/ParasiteImages/A-F/Enterobiasis/Enterobius_LifeCycle.gif
作者 Centers for Disease Control & Prevention (CDC, http://www.dpd.cdc.gov/dpdx)
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本图片是美国卫生及公共服务部旗下的美国疾病控制与预防中心的作品,系有关雇员作为其公务目的所拍摄或制作。作为美国联邦政府的作品,本图片属于公有领域
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2006年5月13日 (六) 18:502006年5月13日 (六) 18:50版本的缩略图435 × 497(21 KB)Patho{{Information| |Description=Enterobiasis [Enterobius vermicularis] Life cycle of Enterobius vermicularis Eggs are deposited on perianal folds. Self-infection occurs by transferring infective eggs to the mouth with hands that have scratched the peria

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