Resumen

OLMOS, LH et al. Presencia de resistencia mixta en una majada de ovejas y primer hallazgo de resistencia a las avermectinas de Cooperia curticei en un establecimiento de la provincia de Salta, Argentina. Cienc. vet. [online]. 2023, vol.25, n.1, pp.4-4. ISSN 1515-1883.

The aim of this work is to describe a case of mixed resistance, finding for the first time low antiparasitic efficacy against Cooperia curticei in a sheep flock in the province of Salta. The work was carried out in an establishment in Cerrillos town, province of Salta. Four groups of 10 animals each were formed: a control group, a group treated with ivermectin, another treated with albendazole and another treated with levamisole. The efficacy results were 50.5% for ivermectin, 68.7% for albendazole, and 99.2% for levamisole. Regarding the efficacy by gender, it was 42.8%, 64.8% and 97% in Haemonchus contortus, 100%, 79.2% and 99.3% for Trichostrongylus colubriformis and 88.5%, 100 % and 100% for C. curticei for ivermectin, albendazole and levamisole respectively. This finding warns about the AR situation and of the wide distribution of the use of various chemical groups under study in the region's flocks, which should be considered.

Palabras clave : Mixed anthelmintic resistance; Sheep; Gastrointestinal nematodes; Salta.

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