Emerging Infectious Disease ISSN: 1080-6059

Macrolide- and Rifampin-Resistant Rhodococcus equi on a Horse Breeding Farm, Kentucky, USA

Alexandra J. Burton, Steeve Giguère

, Tracy L. Sturgill, Londa J. Berghaus, Nathan M. Slovis, Jeremy L. Whitman, Court Levering, Kyle R. Kuskie, and Noah D. Cohen

Author affiliations: Author affiliations: University of Georgia, Athens, Georgia, USA (A.J. Burton, S. Giguère, T.L. Sturgill, L.J. Berghaus); Hagyard Equine Medical Institute, Lexington, Kentucky, USA (N.M. Slovis); Equine Medical Associates, Lexington (J.L. Whitman, C. Levering); Texas A & M University, College Station, Texas, USA (K.R. Kuskie, N.D. Cohen)

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Figure 2

Dendrogram and virtual gel repetitive sequence–based PCR fingerprint patterns of 36 Rhodococcus equi isolates obtained from foals on horse breeding farm, Kentucky, USA, 2011. Macrolide and rifampin susceptibility (S) and resistance (R) are indicated. B–E indicates clusters of drug-resistant isolates. Foals from which pretreatment (pre) and posttreatment (post) samples were obtained are indicated. a and b indicate samples from which 2 isolates were obtained.

Figure 2. . Dendrogram and virtual gel repetitive sequence–based PCR fingerprint patterns of 36 Rhodococcus equi isolates obtained from foals on horse breeding farm, Kentucky, USA, 2011. Macrolide and rifampin susceptibility (S) and resistance (R) are indicated. B–E indicates clusters of drug-resistant isolates. Foals from which pretreatment (pre) and posttreatment (post) samples were obtained are indicated. a and b indicate samples from which 2 isolates were obtained.

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1Current affiliation: Kalon Biotherapeutics LLC, College Station, Texas, USA.

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