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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. 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%. The case highlights the need to review current worm control strategies, especially for young horses. © 2015 Australian Veterinary Association.


A Beasley, G Coleman, A C Kotze. Suspected ivermectin resistance in a south-east Queensland Parascaris equorum population. Australian veterinary journal. 2015 Sep;93(9):305-7

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PMID: 26313207

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