Suspected ivermectin resistance in a south‐east Queensland Parascaris equorum population
2015
Beasley, A | Coleman, G. | Kotze, AC
BACKGROUND: There have been several international reports of macrocyclic lactone (ML)‐resistant Parascaris equorum over the past decade, but the resistance status of Australian P. equorum populations is largely unknown. A case of apparent reduced efficacy of ivermectin against P. equorum in Australia was investigated. METHODS AND RESULTS: A faecal egg count reduction test carried out on a group of weanling foals in south‐east Queensland showed the efficacy of ivermectin to be 65%. CONCLUSION: The case highlights the need to review current worm control strategies, especially for young horses.
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