Volume 19, Number 2—February 2013
Dispatch
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
, Tracy L. Sturgill, Londa J. Berghaus, Nathan M. Slovis, Jeremy L. Whitman, Court Levering, Kyle R. Kuskie, and Noah D. CohenTable 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.
1Current affiliation: Kalon Biotherapeutics LLC, College Station, Texas, USA.
