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Fasciola gigantica



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Fasciola gigantica
Giant liver fluke

General Description:
F. gigantica is a trematode measuring 25-75 mm in length and as much as 12 mm in width; "shoulders" are less evident than in F. hepatica.

Life Cycle:
As with F. hepatica, the indirect life cycle uses a snail (Lymnaea) as the intermediate host. However, these snails live in permanent rather than temporary bodies of water, preferring slow-moving, clear water that supports plant life. Eggs on pasture hatch in about 17 days. Development in the snail requires from 75 to 175 days, depending on the temperature. The fluke multiplies during intermediate stages in the snails.

Gall bladder and bile ducts of the liver.

Geographical Distribution:
Africa, Formosa, Hawaii, the Philippines, India, Pakistan.

F. gigantica is a common parasite of cattle in its several geographical areas, causing anemia and decreased growth. In Hawaii about 50% of beef cattle are infected. Damaged livers are condemned at slaughter.

Effect on Host:
The giant liver fluke causes symptoms similar to those of F.hepatica: anemia, edema, and weight loss.

Diagnostic Information:
Fasciola eggs appear in feces. Adult flukes are easily seen in the liver at slaughter.

Elimination of the snails is difficult, because they live in permanent bodies of water. Administration of flukicides is effective against the adult flukes.


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