Abstract
Macrolide and rifampin resistance developed on a horse breeding farm after widespread use was instituted for treatment of subclinical pulmonary lesions in foals. Resistance occurred in 6 (24%) of 25 pretreatment and 8 (62%) of 13 (62%) posttreatment isolates from affected foals. Drug-resistant isolates formed 2 distinct genotypic clusters.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Actinomycetales Infections / diagnostic imaging
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Actinomycetales Infections / drug therapy
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Actinomycetales Infections / microbiology
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Actinomycetales Infections / veterinary*
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Animals
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Asymptomatic Infections
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Breeding
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Drug Resistance, Multiple, Bacterial*
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Genes, Bacterial
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Horse Diseases / diagnostic imaging
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Horse Diseases / drug therapy
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Horse Diseases / microbiology*
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Horses
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Kentucky
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Macrolides / pharmacology*
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Molecular Typing
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Phylogeny
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Pneumonia, Bacterial / diagnostic imaging
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Pneumonia, Bacterial / drug therapy
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Pneumonia, Bacterial / veterinary*
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Repetitive Sequences, Nucleic Acid / genetics
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Rhodococcus equi / drug effects*
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Rhodococcus equi / genetics
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Rhodococcus equi / isolation & purification
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Rifampin / pharmacology*
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Ultrasonography