Macrolide- and rifampin-resistant Rhodococcus equi on a horse breeding farm, Kentucky, USA

Emerg Infect Dis. 2013 Feb;19(2):282-5. doi: 10.3201/eid1902.121210.

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

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actinomycetales Infections / diagnostic imaging
  • Actinomycetales Infections / drug therapy
  • Actinomycetales Infections / microbiology
  • Actinomycetales Infections / veterinary*
  • Animals
  • Asymptomatic Infections
  • Breeding
  • Drug Resistance, Multiple, Bacterial*
  • Genes, Bacterial
  • Horse Diseases / diagnostic imaging
  • Horse Diseases / drug therapy
  • Horse Diseases / microbiology*
  • Horses
  • Kentucky
  • Macrolides / pharmacology*
  • Molecular Typing
  • Phylogeny
  • Pneumonia, Bacterial / diagnostic imaging
  • Pneumonia, Bacterial / drug therapy
  • Pneumonia, Bacterial / veterinary*
  • Repetitive Sequences, Nucleic Acid / genetics
  • Rhodococcus equi / drug effects*
  • Rhodococcus equi / genetics
  • Rhodococcus equi / isolation & purification
  • Rifampin / pharmacology*
  • Ultrasonography

Substances

  • Macrolides
  • Rifampin