Table 1 Distribution and antimicrobial resistance of equine Staphylococcus samples submitted to the University of Kentucky veterinary diagnostic laboratory, 1993–2009
Variable | No. of samples tested | Percentage of samples testede (%) | 95% CIa | AMRb samples | AMRb, f (%) | 95% CIa | MDRc samples | MDRc, g (%) | 95% CIa |
|---|---|---|---|---|---|---|---|---|---|
Breed | n = 1577 |  |  | n = 1046 |  |  |  |  |  |
 Arabian | 19 | 1.2 | 0.7, 1.7 | 13 | 68.4 | 43.5, 87.4 | 4 | 21.1 | 6.1, 45.6 |
 American Saddlebred | 63 | 4.0 | 3.0, 5.0 | 34 | 54.0 | 40.9, 66.6 | 10 | 15.9 | 7.9, 27.3 |
 Mixed breed | 30 | 1.9 | 1.2, 2.6 | 12 | 40.0 | 22.7, 59.4 | 3 | 10.0 | 2.1, 26.5 |
 Quarter horse | 60 | 3.8 | 2.9, 4.8 | 28 | 46.7 | 33.8, 60.0 | 11 | 18.3 | 9.5, 30.4 |
 Rocky Mountain Saddlebred | 16 | 1.0 | 0.5, 1.5 | 7 | 43.8 | 19.8, 70.1 | 1 | 6.3 | 0.2, 30.2 |
 Standardbred | 35 | 2.2 | 1.6, 3.1 | 24 | 68.6 | 50.7, 83.2 | 13 | 37.1 | 21.5, 55.1 |
 Thoroughbred | 1172 | 74.3 | 72.2, 76.5 | 826 | 70.5 | 67.8, 73.1 | 365 | 31.1 | 28.5, 33.9 |
 Tennessee Walking Horse | 88 | 5.6 | 4.5, 6.7 | 46 | 52.3 | 41.4, 63.0 | 3 | 3.4 | 8.5, 75.5 |
 Other breeds | 94 | 6.0 | 4.8, 7.3 | 56 | 59.6 | 49.0, 69.6 | 9 | 9.6 | 4.5, 17.4 |
Sex | n = 1377 |  |  | n = 928 |  |  |  |  |  |
 Female | 1152 | 83.7 | 81.6, 85.6 | 784 | 68.1 | 65.3, 70.7 | 293 | 25.4 | 22.9, 28.1 |
 Male | 225 | 16.3 | 14.4, 18.4 | 144 | 64.0 | 57.4, 70.3 | 74 | 32.9 | 26.6, 39.5 |
Age Groups | n = 717 |  |  | n = 459 |  |  |  |  |  |
  > 4 years | 330 | 46.0 | 42.4, 49.7 | 198 | 60.0 | 54.5, 65.3 | 68 | 34.3 | 16.4, 25.4 |
 2–4 years | 52 | 7.3 | 5.5, 9.4 | 35 | 67.3 | 52.9, 79.7 | 15 | 28.9 | 17.1, 43.1 |
 1–2 years | 32 | 4.5 | 3.0, 6.0 | 21 | 65.6 | 46.8, 81.4 | 6 | 18.8 | 7.2, 36.4 |
  < 1 year | 141 | 19.7 | 16.8, 22.6 | 107 | 75.9 | 68.0, 82.7 | 53 | 37.6 | 29.6, 46.1 |
 Aborted fetus (0 years) | 162 | 22.6 | 19.5, 25.7 | 98 | 60.5 | 52.5, 68.1 | 35 | 21.6 | 15.5, 28.8 |
Species of organism | n = 1711 |  |  | n = 1131 |  |  |  |  |  |
 CoNSd | 817 | 47.8 | 45.4, 50.1 | 491 | 60.1 | 56.7, 63.5 | 163 | 20.0 | 17.3, 22.9 |
 Staphylococcus aureus | 689 | 40.3 | 37.9, 42.6 | 531 | 77.1 | 73.7, 80.2 | 264 | 38.3 | 34.7, 42.1 |
 Staphylococcus hyicus | 75 | 4.4 | 3.4, 5.4 | 31 | 41.3 | 30.1, 53.3 | 1 | 1.3 | 0.03, 7.2 |
 Staphylococcus intermedius | 130 | 7.6 | 6.3, 8.9 | 78 | 60.0 | 51.1, 68.5 | 16 | 12.3 | 7.2, 19.2 |