Prevalence of anthelmintic resistance on sheep and goat farms in the southeastern United States.
J Am Vet Med Assoc
; 233(12): 1913-9, 2008 Dec 15.
Article
em En
| MEDLINE
| ID: mdl-19072608
ABSTRACT
OBJECTIVE:
To determine prevalence of anthelmintic resistance on sheep and goat farms in the southeastern United States.DESIGN:
Cross-sectional study. ANIMALS Sheep and goats from 46 farms in 8 southern states, Puerto Rico, and St Croix in the US Virgin Islands. PROCEDURES Parasite eggs were isolated from fecal samples, and susceptibility to benzimidazole, imidathiazole, and avermectin-milbemycin anthelmintics was evaluated with a commercial larval development assay.RESULTS:
Haemonchus contortus was the most common parasite on 44 of 46 farms; Trichostrongylus colubriformis was the second most commonly identified parasite. Haemonchus contortus from 45 (98%), 25 (54%), 35 (76%), and 11 (24%) farms were resistant to benzimidazole, levamisole, ivermectin, and moxidectin, respectively. Resistance to all 3 classes of anthelmintics was detected on 22 (48%) farms, and resistance to all 3 classes plus moxidectin was detected on 8 farms (17%). CONCLUSIONS AND CLINICAL RELEVANCE Findings provided strong evidence that anthelmintic resistance is a serious problem on small ruminant farms throughout the southeastern United States. Owing to the frequent movement of animals among regions, the prevalence of resistance in other regions of the United States is likely to also be high. Consequently, testing of parasite eggs for anthelmintic resistance should be a routine part of parasite management on small ruminant farms.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Doenças dos Ovinos
/
Resistência a Medicamentos
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Doenças das Cabras
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Helmintíase Animal
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Anti-Helmínticos
Tipo de estudo:
Observational_studies
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Prevalence_studies
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Prognostic_studies
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Risk_factors_studies
Limite:
Animals
País como assunto:
America do norte
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article