Use of Ivermectin as Endoparasiticide in Tropical Cattle Herds Generates Resistance in Gastrointestinal Nematodes and the Tick Rhipicephalus microplus (Acari: Ixodidae).

@article{AlegriaLopez2015UseOI,
  title={Use of Ivermectin as Endoparasiticide in Tropical Cattle Herds Generates Resistance in Gastrointestinal Nematodes and the Tick Rhipicephalus microplus (Acari: Ixodidae).},
  author={Miguel A Alegria-Lopez and Roger Ivan Rodriguez-Vivas and Juan F J Torres-Acosta and Melina M Ojeda-Chi and Jos{\'e} A Rosado-Aguilar},
  journal={Journal of medical entomology},
  year={2015},
  volume={52 2},
  pages={214-21}
}
The objective of the present study was to determine simultaneously the status of resistance against ivermectin (IVM) in gastrointestinal nematodes (GIN) and Rhipicephalus microplus (Canestrini, 1888) ticks in 12 cattle farms where IVM was used for the control of GIN in the Mexican tropics. Six farms had frequent use of IVM (≥ 4 times per year) and six farms had low frequency of IVM use (1-2 times per year). The fecal egg count reduction test and the larval immersion test were used to determine… CONTINUE READING
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