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Table 1 Distribution and antimicrobial resistance of equine Staphylococcus samples submitted to the University of Kentucky veterinary diagnostic laboratory, 1993–2009

From: An epidemiologic study of antimicrobial resistance of Staphylococcus species isolated from equine samples submitted to a diagnostic laboratory

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
  1. a95% Confidence Interval
  2. bAMR: Antimicrobial Resistance
  3. cMDR: Multidrug Resistance
  4. dCoagulase negative Staphylococcus
  5. eThe denominators are the number of samples tested for each variable and vary (e.g. breed = 1577; sex = 1377; etc) due to missing data
  6. fThe denominators for the percentage of AMR are the number of samples tested per row
  7. gThe denominators for the percentage of MDR are the number of samples tested per row