liver fluke


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liver fluke:

see flukefluke,
parasitic flatworm of the trematoda class, related to the tapeworm. Instead of the cilia, external sense organs, and epidermis of the free-living flatworms, adult flukes have sucking disks with which they cling to their hosts and an external cuticle that resists digestion
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Liver Fluke

 

(Fasciola hepatica), a parasitic worm of the class Trematoda. The leaf-shaped body has a length of 2–5 cm. At the anterior end are the oral and ventral suckers. The liver fluke infests the liver, bile ducts, and gallbladder usually of herbivorous mammals, and more rarely of humans. The ova develop in water; the larvae that hatch from these ova and the partheno-genetic generations develop in an intermediate host, which is usually a mollusk, for example, the small freshwater snails of the family Lymnaeidae. The larva—a cercaria—emerges from the mollusk, swims, and settles on aquatic and coastal plants, becoming encysted as it converts to an adolescaria. The larvae that are swallowed by the definitive host penetrate the liver, where they grow and mature, eventually causing the disease fascioliasis.

Liver flukes are controlled by draining swamps, where lym-naeids hatch, by exterminating lymnaeids, by rotating pastures, and by treating cattle with anthelmintic drugs.

REFERENCE

Shul’ts, R. S., and G. I. Dikov. Gel’minty i gel’mintozy sel’skokhoziaist-vennykh zhivotnykh. Alma-Ata, 1964.

I. E. BYKHOVSKAIA

liver fluke

[′liv·ər ‚flük]
(invertebrate zoology)
Any trematode, especially Clonorchis sinensis, that lodges in the biliary passages within the liver.
References in periodicals archive ?
Gouveia et al., "Schistosome and liver fluke derived catechol-estrogens and helminth associated cancers," Frontiers in Genetics, vol.
The highest positive sample percentage was observed for Liver fluke (46.67%) followed by Emeria (43.33%) and Haemonchus (40.00%).
The stimulus for capsule formation is unknown, but may be functionally similar to the proline stimulus in the related liver fluke, Fasciola hepatica (Wolf-Spengler and Isseroff 1983).
Prevalence and epidemiology: The cercariae of liver flukes were observed from a pond first time by Otto Muller in 1773 (Andrews 1999).
The results of this study demonstrate that the human liver fluke O.
Fletcher et al., "Evidence for multiple mitochondrial lineages of Fasciola hepatica (liver fluke) within infrapopulations from cattle and sheep," Parasitology Research, vol.
A drop of this mixture is placed on a glass slide, covered with a cover slip and then examined the prepared slide using a microscope for the examination of liver fluke eggs.
A cross-sectional coprological survey of liver flukes in cattle and sheep from an area of the southern Italian Apennines.
Fasciola hepatica, a liver fluke, is observed in areas of sheep farming and is common in developing countries (3).
ENDEMIC liver fluke in Wales is having a devastating welfare and financial impact on sheep farms, a monitoring project has concluded.
Restriction enzyme mapping of ribosomal DNA can distinguish between Fasciolid (liver fluke) species.
Estimates show that more than 300 million cattle, buffaloes, sheep, goats, pigs, and horses worldwide are infected with liver fluke causing significant economic losses of $ 3 billion yearly.