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Table 2 Distribution of antimicrobial resistance categorized by antimicrobial class among 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

Antimicrobial class

Drug

AMRa samples

AMRa %

95% CIb

MDRc samples

MDRc %

95%CIb

Aminoglycosides

 

516/1710

30.2

28.0, 32.4

377/1710

22.1

20.1, 24.1

 

Neomycin

53/1582

3.4

2.5, 4.4

46/1582

2.9

2.1, 3.9

Kanamycin

486/1682

28.9

26.7, 31.1

369/1682

21.9

20.0, 24.0

Streptomycin

59/287

20.6

16.0, 25.7

28/287

9.8

6.6, 13.8

Gentamicin

369/1622

22.8

20.7, 24.9

270/1622

16.7

14.9, 18.6

β-lactams

 

841/1710

49.2

46.8, 51.6

402/1710

23.5

21.5, 25.6

 

Penicillin

814/1539

52.9

50.4, 55.4

396/1539

25.7

23.6, 28.0

Oxacillin

254/1634

15.6

13.8, 17.4

235/1634

14.4

12.7, 16.2

Amoxicillin/Clavulanic Acid

115/1644

7.0

5.8, 8.3

107/1644

6.5

5.4, 7.8

Macrolides

 

292/1668

17.5

15.7, 19.4

249/1668

14.9

13.3, 16.7

 

Erythromycin

292/1668

17.5

15.7, 19.4

249/1668

14.9

13.3, 16.7

Sulfonamides

 

463/1645

28.2

26.0, 30.4

372/1645

22.6

20.6, 24.7

 

Sulfonamide

488/1702

28.7

26.5, 30.9

372/1702

21.9

19.9, 24.0

Trimethoprim-sulfadiazine

330/1355

24.4

22.1, 26.7

297/1355

21.9

19.7, 24.2

Lincosamides

 

28/970

2.9

1.9, 4.2

25/970

2.6

1.7, 3.8

 

Lincomycin

28/970

2.9

1.9, 4.2

25/970

2.6

1.7, 3.8

Aminocoumarins

 

141/1578

8.9

7.6, 10.6

31/1578

2.0

1.3, 2.8

 

Novobiocin

141/1578

8.9

7.6, 10.6

31/1578

2.0

1.3, 2.8

Cephalosporins

 

63/1711

3.7

2.8, 4.7

63/1711

3.7

2.8, 17.1

 

Cephalothin

48/1692

2.8

2.1, 3.7

48/1692

2.8

2.1, 3.7

Fluoroquinolones

 

1/25

4.0

0.1, 20.4

1/25

4.0

0.1, 20.4

 

Enrofloxacin

1/24

4.2

0.1, 21.1

1/24

4.2

0.1, 21.1

Tetracyclines

 

451/1682

26.8

24.7, 29.0

326/1682

19.4

17.5, 21.4

 

Tetracycline

451/1682

26.8

24.7, 29.0

326/1682

19.4

17.5, 21.4

Polypeptides

 

45/1649

2.7

2.0, 3.6

36/1649

2.2

1.5, 3.0

 

Bacitracin

45/1649

2.7

2.0, 3.6

36/1649

2.2

1.5, 3.0

  1. aAMR: Antimicrobial Resistance
  2. b95% Confidence Interval
  3. cMDR: Multidrug Resistance