The epidemiology ofFasciola hepaticainfections in sheep on aLymnaea columellahabitat in the manawatu

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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, 1969 Pullan, N. B. 1969. The first report in New Zealand of Lymnaea columella Say (Mollusca: Gastropoda) an intermediate host of the liver fluke Fasciola hepatica. N.Z. vet. J., 17: 255–256. [Taylor & Francis Online] [Google Scholar] ; Pullan and Whitten, 1972 Pullan, N. B. and Whitten, L. K. 1972. Liver fluke Fasciala hepatica, in New Zealand. Part 1. A spreading parasite in sheep and cattle. N.Z. vet. J., 20: 69–72. [Taylor & Francis Online] [Google Scholar] ; Pullan et al., 1972 Pullan, N. B. and Mansfield, Caroline B. 1972. Fasciola hepatica in sheep: a preliminary epidemiological study. N.Z. vet. J., 20: 39–40. [Taylor & Francis Online] [Google Scholar] ). 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.