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Volume 19, Number 2—February 2013


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

Alexandra J. Burton, Steeve GiguèreComments to Author , 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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Table 2

Characteristics of pretreatment and posttreatment Rhodococcus equi isolates obtained from foals on a horse breeding farm, Kentucky, USA, 2011*

Foal ID no. Pretreatment isolates (cluster) % Similarity† Posttreatment isolates (cluster)
7-11 S 97.5 S
5-11 S 84.3 S
14-11 R (E) 96.4 R (E)
3-11 R (B) 96.5 R (B)
4-11 R (B) 97.4 R (B)
17-11 R (C) 98.5 R (C)
20-11 S 83.1 R (B)
18-11 S 78 R (C)
11-11 R (B) 87.2 S
15-11‡ S 83.1 S
NA 73.2 R (D)
16-11‡ S 78.8 R (D)
R (B) 80.8 NA

*ID, identification; S, susceptible; R, resistant; NA, not applicable.
†Determined by using Pearson correlation coefficient and unweighted pair-group method with arithmetic means.
‡Two isolates were recovered from the pretreatment (foal ID 16-11) or posttreatment (foal ID 15-11) sampling.

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

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