Trichinella LifeCycle

Autor:

CDC

Credit:

http://www.dpd.cdc.gov/dpdx/images/ParasiteImages/S-Z/Trichinellosis/Trichinella_LifeCycle.gif

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https://www.plwiki.pl/b/8be6a

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Wikimedia Commons

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551 x 548 Pixel (64402 Bytes)

Opis:

Trichinellosis [Trichinella spiralis] [T. pseudospiralis] [T. nativa] [T. nelsoni] [T. britovi]

Life cycle of Trichinella spp.

Trichinellosis is acquired by ingesting meat containing cysts (encysted larvae) of Trichinella. After exposure to gastric acid and pepsin, the larvae are released from the cysts and invade the small bowel mucosa where they develop into adult worms (female 2.2 mm in length, males 1.2 mm; life span in the small bowel: 4 weeks). After 1 week, the females release larvae that migrate to the striated muscles where they encyst. Trichinella pseudospiralis, however, does not encyst. Encystment is completed in 4 to 5 weeks and the encysted larvae may remain viable for several years. Ingestion of the encysted larvae perpetuates the cycle. Rats and rodents are primarily responsible for maintaining the endemicity of this infection. Carnivorous/omnivorous animals, such as pigs or bears, feed on infected rodents or meat from other animals. Different animal hosts are implicated in the life cycle of the different species of Trichinella. Humans are accidentally infected when eating improperly processed meat of these carnivorous animals (or eating food contaminated with such meat).

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Public domain

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Ta grafika została utworzona przez pracownika Centrum Zwalczania i Zapobiegania Chorób będącego częścią Ministerstwa Zdrowia i Usług Społecznych podczas wykonywania czynności służbowych. Jako utwór Rządu Federalnego Stanów Zjednoczonych, grafika ta znajduje się w domenie publicznej.