Anthelmintic efficacy on Parascaris equorum in foals on Swedish studs.

Acta Veterinaria Scandinavica
Eva Osterman Lind, Dan Christensson

Abstract

In the last few years stud farms have experienced increasing problems with Parascaris equorum infections in foals despite intensive deworming programs. This has led to the question as to whether the anthelmintic drugs used against this parasite are failing. This study aimed to investigate the efficacy of ivermectin, fenbendazole and pyrantel on the faecal output of ascarid eggs of foals. A Faecal Egg Count Reduction Test (FECRT) was performed on nine large studs in Sweden. Anthelmintic drugs were given orally and faecal samples were examined for ascarid eggs on the day of deworming and 14 days later. Faecal Egg Count Reductions (FECRs) were calculated on arithmetic means of transformed individual FECRs and on arithmetic means of individual FECRs. Seventy-nine (48%) out of a total of 165 foals sampled were positive for P. equorum eggs before deworming and 66 of these met the criteria for being used in the efficacy assessment. It was shown that there was no, or very low activity of ivermectin on the output of ascarid eggs in the majority of the foals, whereas for fenbendazole and pyrantel it was >90%. Ivermectin resistance was shown in 5 out of 6 farms. Therefore, ivermectin should not be the drug of choice in the control of P. e...Continue Reading

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Citations

Apr 17, 2013·Epidemiology and Infection·M De Garine-WichatitskyA Michel
Apr 8, 2014·Veterinary Parasitology·M K NielsenG von Samson-Himmelstjerna
Jan 18, 2014·Veterinary Parasitology·M K NielsenR M Kaplan
Feb 4, 2014·Veterinary Parasitology·Andrew S PeregrineMartin K Nielsen
Nov 22, 2012·Infection, Genetics and Evolution : Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases·E TydénJ Höglund
May 21, 2013·Molecular and Biochemical Parasitology·E TydénJ Höglund
May 26, 2017·The Veterinary Quarterly·Abdullah D AlanaziHamdan I Al-Mohammed
Apr 19, 2019·Veterinary Record Open·Valentina TiškinaPikka Jokelainen
Aug 14, 2021·Infection, Genetics and Evolution : Journal of Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases·Georg von Samson-HimmelstjernaJürgen Krücken

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