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Suspected ivermectin resistance in a south-east Queensland Parascaris equorum population
A Beasley1, G Coleman2, A C Kotze3
1School of Veterinary Science, University of Queensland, Gatton, Queensland, Australia. a.beasley@uq.edu.au.
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.
