F.hepatica infection is found in rural areas of temperate and tropical regions, related to cattle herding.
High prevalence is described in Europe and Latin America.
The adults live in biliary ducts for up to 10 years. Fasciola hepatica , living adult in bile duct of sheep. Eggs can be found in faeces 3-4 months after penetration. Repeated examinations and concentration techniques are recommended. Serology is useful when the clinical picture is compatible and eggs are not found.