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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).

Vir

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

Avtor

CDC

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	Datum in čas	Sličica	Velikost	Uporabnik	Komentar
trenutno	23:33, 18. julij 2015		551 × 548 (63 KB)	CFCF	http://www.cdc.gov/dpdx/trichinellosis/index.html accessed 2015
	21:31, 14. maj 2006		435 × 501 (25 KB)	Patho	{{Information\| \|Description=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