Liver fluke disease (fasciolosis) is caused by the Fasciola hepatica parasite. The cause of the disease can be from one of two causes (or both), 1) large numbers of immature flukes migrate through the liver, or 2) the presence of adult flukes in the bile ducts. Liver fluke can infect all grazing animals (and man) but mainly affects sheep and cattle. It is most pathogenic in sheep.
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