The effects of a programme of repeated dosing of all stock for fascioliasis over a four year period on a north Devon farm is described. There was a decline in the average percentage of infection. Observations on the snail intermediate host and on a neighbouring farm suggested that at least some of the improvement was due to environmental factors. Although at the end of the period the level of infection was lower, there was no evidence that further intensification of the programme would lead to eradication.
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