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UK Veterinarians Warn of Impending Multi-Drug Resistance in Worms

August 2014 by Cristina Wilkins, Editor, Horses and People Magazine

A recent paper published in the International Journal for Parasitology has confirmed that egg reappearance periods after treatment are shortening - an early indicator that worms are developing resistance to anthelmitic drugs. The lack of any new worming compounds on the horizon is driving researchers to find better ways to manage worms in domestic horses.  

The research, which was carried out on over 400 horses from 16 separate Thoroughbred studs in the United Kingdom, showed sub-optimal efficacy of all four classes of anthelmitics available, including ivermectin, moxidectin, pyrantel and fenbendazole.