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Abstract
Extract
Fasciola hepatica has become increasingly widespread in New Zealand in recent years following the colonization of large areas of the country by the exotic snail Lymnaea columella (Pullan, Citation1969; Pullan and Whitten, Citation1972; Pullan et al., Citation1972). In October 1969, F. hepatica was found to be established in sheep and cattle on a farm 40 km from Palmerston North in an area previously regarded as free of fluke infection.