In the United States F. The habitat of Fasciola gigantica changes with the stage of its life cycle. Adult F. Eggs shed by adults are located in the intestinal track of mammals and also in the wild. Free swimming cercarias are found in the bodies of fresh water that are in close proximity of its definitive host. Temperatures above 10 degree Celsius are required for the development of the miracidia larvae stage.
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The trematodes Fasciola hepatica also known as the common liver fluke or the sheep liver fluke and Fasciola gigantica are large liver flukes F. Although F. These forms usually have intermediate morphologic characteristics e. Further research into the nature and origin of these forms is ongoing. Immature eggs are discharged in the biliary ducts and passed in the stool.
In the snail, the parasites undergo several developmental stages sporocysts , rediae , and cercariae. The cercariae are released from the snail and encyst as metacercariae on aquatic vegetation or other substrates. Humans and other mammals become infected by ingesting metacercariae-contaminated vegetation e. After ingestion, the metacercariae excyst in the duodenum and penetrate through the intestinal wall into the peritoneal cavity.
The immature flukes then migrate through the liver parenchyma into biliary ducts, where they mature into adult flukes and produce eggs. In humans, maturation from metacercariae into adult flukes usually takes about 3—4 months; development of F. Contact Us. Skip directly to site content Skip directly to page options Skip directly to A-Z link. Section Navigation. Biology Minus Related Pages.
Causal Agent The trematodes Fasciola hepatica also known as the common liver fluke or the sheep liver fluke and Fasciola gigantica are large liver flukes F. Life Cycle View Larger. To receive email updates about this page, enter your email address: Email Address. What's this? Links with this icon indicate that you are leaving the CDC website. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
Fasciola gigantica: parasite
The trematodes Fasciola hepatica also known as the common liver fluke or the sheep liver fluke and Fasciola gigantica are large liver flukes F. Although F. These forms usually have intermediate morphologic characteristics e. Further research into the nature and origin of these forms is ongoing.
Fasciola gigantica is a parasitic flatworm of the class Trematoda , which causes tropical fascioliasis. It is regarded as one of the most important single platyhelminth infections of ruminants in Asia and Africa. The infection is commonly called fasciolosis. The prevalence of F. Fasciola gigantica causes outbreaks in tropical areas of southern Asia, Southeast Asia, and Africa. The geographical distribution of F.