Table 3

Distribution of MIC values for MRSA CC398 identified in this study

No. of isolates with MIC (mg/L)

Resistant

(non-wild-type)a


Antimicrobial agent(s)

0.25

0.5

1

2

4

8

16

32

64

128

256

no.

%


OXA + 2% NaCl

-

4

2

1

10

57

78

-

-

-

-

145

95

ERY

4

45

10

0

0

0

0

93

-

-

-

93

61

CLI

48

6

1

0

1

1

4

90

1

-

-

104

68

TET

-

-

0

0

0

0

0

1

37

114

-

152

100

CHL

-

-

-

0

2

58

82

4

4

2

0

10

6.6

GEN

-

57

48

14

4

3

3

6

4

13

-

33

22

KAN

-

-

-

-

-

77

23

15

10

3

24

75

49

CIP

-

134

10

2

3

3

0

0

0

-

-

8

5.3

SXTb

66

24

40

18

3

1

0

-

-

-

-

61

40

QUI/DAL

-

52

52

25

12

5

6

-

-

-

-

48

32

MUP

-

-

152

0

0

0

0

-

-

-

-

0

0.0

LZD

-

-

5

56

91

0

0

-

-

-

-

0

0.0

VAN

-

-

-

152

0

0

0

0

-

-

-

0

0.0


OXA: oxacillin, ERY: erythromycin, CLI: clindamycin, TET: tetracycline, CHL: chloramphenicol, GEN: gentamicin, KAN: kanamycin, CIP: ciprofloxacin, SXT: sulfamethoxazole/trimethoprim, QUI/DAL: quinupristin/dalfopristin, MUP: mupirocin, LZD: linezolid, and VAN: vancomycin.

a Isolates were classified as resistant after EUCAST epidemiological cut-off values (black vertical lines) for MRSA and/or S. aureus valid at the time of submission.

b The MIC values of sulfamethoxazole/trimethoprim (19:1) are given as trimethoprim MIC values.

Dilution ranges tested are framed by -. Isolates resistant to the highest tested concentration are given in the next concentration level (bold). Values for the lowest concentration include isolates with MICs below the tested range.

Alt et al. BMC Veterinary Research 2011 7:69   doi:10.1186/1746-6148-7-69

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