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No Evidence for Resistance to Fenbendazole in Trichostrongylus tenuis, a Nematode Parasite of the Red Grouse

RUTH COX, DAVID NEWBORN, DAVID BAINES, CHRISTOPHER J. THOMAS and THOMAS N. SHERRATT
The Journal of Wildlife Management
Vol. 74, No. 8 (November 2010), pp. 1799-1805
Published by: Wiley on behalf of the Wildlife Society
Stable URL: http://www.jstor.org/stable/40925769
Page Count: 7
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No Evidence for Resistance to Fenbendazole in Trichostrongylus tenuis, a Nematode Parasite of the Red Grouse
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Abstract

The parasitic nematode Trichostrongylus tenuis has a detrimental effect on red grouse (Lagopus lagopus scoticus) at the individual and population levels. Treatment using grit coated with the anthelmintic fenbendazole hydrochloride reduces parasite infection and increases grouse density. However, a frequent and low dose of anthelmintic increases selection pressure for parasite resistance, a serious practical and economic problem. We used an egg hatch assay to test resistance of T. tenuis from 12 moors in northern England, which differed in grit treatment intensity. The anthelmintic concentration that prevented 50% and 95% of T. tenuis eggs from hatching (ED₄₀ and ED ₉₄, respectively) did not differ among moors and were not related to treatment. We suggest annual monitoring and responsible anthelmintic use to prevent resistance so that medicated grit continues to enhance red grouse management.

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