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October 1, 2025PathogensOpen Access

Coprological and Molecular Analyses of Ruminant Farms in Québec, Canada, Show a Variable Efficacy of Ivermectin Against Gastro-Intestinal Nematodes

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Authors

BRBehrouz Rezanezhad-DizajiLALevon AbrahamyanMRMarjolaine Rousseau

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Overview

Analyses show variable efficacy of ivermectin against gastro-intestinal nematodes in ruminant farms, suggesting emerging resistance.

Key Points

  • The study found that ivermectin showed variable efficacy against gastro-intestinal nematodes in ruminant farms.
  • Fecal Egg Count Reduction Test revealed an efficacy range of 95.5–100% in one farm, while two farms exhibited reduced efficacy.
  • Molecular analyses identified various gastro-intestinal nematode species affecting farms, highlighting a clinical challenge for ruminant producers.
  • Results indicate the likely emergence of ivermectin resistance, necessitating alternative parasite management strategies.

Cite This Study

Rezanezhad-Dizaji et al. (2025) studied this question.

synapsesocial.com/papers/68dd91d5fe798ba2fc498ef6https://doi.org/10.3390/pathogens14100984
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