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Q: I have read several articles about scratches this year, and I never see the solution that without fail clears up my horses’ scratches. For my horses, if I deworm a couple of times with ivermectin/praziquantel a week or two apart, their scratches disappear. I don’t have to put any topicals on or scrape them off. I’m wondering why I have never read about this.—Donna Rupp, Orland Park, Illinois
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Martin Krarup Nielsen, DVM, PhD, Dipl. ACVM, is an associate professor of parasitology and the Schlaikjer professor in equine infectious disease at the University of Kentucky's Maxwell H. Gluck Equine Research Center, in Lexington. His research focus includes parasite diagnostic measures and drug resistance. Known as a foremost expert in the field of equine parasites, Nielsen chaired the American Association of Equine Practitioners’ (AAEP) parasite control task force, which produced the “AAEP Parasite Control Guidelines.”
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