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Animals (Basel). 2020 Oct 22;10(11). doi: 10.3390/ani10111943.

Efficacy of Oxyclozanide and Closantel against Rumen Flukes (Paramphistomidae) in Naturally Infected Sheep.

Animals : an open access journal from MDPI

David García-Dios, Pablo Díaz, Miguel Viña, Susana Remesar, Alberto Prieto, Gonzalo López-Lorenzo, Jose Manuel Díaz Cao, Rosario Panadero, Pablo Díez-Baños, Ceferino Manuel López

Affiliations

  1. Investigación en Sanidad Animal: Galicia (Grupo INVESAGA), Department of Animal Pathology, Faculty of Veterinary Medicine (Universidade de Santiago de Compostela), 27002 Lugo, Spain.

PMID: 33105640 PMCID: PMC7690378 DOI: 10.3390/ani10111943

Abstract

Paramphistomosis is considered an emergent disease of ruminants in Europe. Some drugs have been found effective for treating paramphistomid infections in cattle, but data in sheep are currently limited. Thus, faecal samples from 25 adult sheep naturally infected with paramphistomids were collected weekly to test the efficacy of oxyclozanide and closantel. Three groups were performed: nine animals orally treated with a single dose of oxyclozanide (15 mg/kg bodyweight (BW) integrated the G-OXI group, whereas eight sheep orally treated with a single dose of closantel (10 mg/kg BW) were placed in a group called G-CLS. Eight untreated controls constituted the group G-CON. Oxyclozanide showed efficacies up to 90% until week 11 post-treatment, with a maximum efficacy of 98.3%, and significant differences were found between G-OXI and G-CON until the 26th week post-treatment. Closantel was insufficiently active (0-81%) throughout the study and differences compared to G-CON were never found. The present study reveals that oxyclozanide given at a single oral dose of 15 mg/kg BW is highly effective against adult rumen flukes in sheep. In addition, the use of a single oral dose of closantel at 10 mg/kg BW is not recommended for treating paramphistomid infections in sheep.

Keywords: closantel; efficacy; oxyclozanide; paramphistomidae; sheep

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