File:Enterobius vermicularis LifeCycle B.svg

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English: 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 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.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 and the adults establish themselves in 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 migration of newly hatched larvae from the anal skin back into the rectum, may occur but the frequency with which this happens is unknown.
Español: Enterobiasis Enterobius vermicularis
Ciclo biológico de Enterobius vermicularis
Los huevos se depositan en los pliegues perianales (1). La auto-infección ocurre por transferencia de los huevos infecciosos a la boca mediante las manos luego de rascarse la zona perianal (2). El contagio persona a persona también puede ocurrir mediante la manipulación de ropa o sábanas contaminadas. La enterobiasis también se puede adquirir a través de superficies ambientales que estén contaminadas con huevos (ej.: cortinas, alfombras). Unos pocos huevos pueden propagarse por el aire y ser inhalados, al tragarlos siguen el mismo desarrollo que los ingeridos.
Luego de la ingestión de los huevos infecciosos, las larvas eclosionan en el intestino delgado (3) y los adultos se establecen en el colon (4). Entre la ingestión de los huevos infecciosos hasta la oviposición de las hembras adultas transcurre alrededor de un mes. El tiempo de vida de los adultos es de dos meses aproximadamente. Las hembras grávidas migran en horas nocturnas por fuera del ano y ovipositan mientras reptan sobre la piel de la zona perianal (5). En 4 a 6 horas -bajo condiciones óptimas- se desarrollan las larvas contenidas dentro de los huevos (y el huevo se transforma en infeccioso) (6). Puede ocurrir retroinfección, es decir, la migración de larvas recién nacidas en la piel anal hacia dentro del recto, pero no se sabe con qué frecuencia esto sucede.
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Source https://www.cdc.gov/dpdx/enterobiasis/modules/Enterobius_LifeCycle.gif
Author Derivative work by André Koehne
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This image is a work of the Centers for Disease Control and Prevention, part of the United States Department of Health and Human Services, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.
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current11:33, 22 May 2008Thumbnail for version as of 11:33, 22 May 2008535 × 544 (30 KB)André Koehne (talk | contribs){{Information |Description={{en|Enterobiasis ''Enterobius vermicularis''<br>Life cycle of Enterobius vermicularis <br>Eggs are deposited on perianal folds. Self-infection occurs by transferring infective eggs to the mouth with hands that have scratched t

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