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Table 3 Minimum inhibitory concentration (MIC) of antibiotics against CoNS isolated from fermented food samples

From: Antimicrobial resistance in coagulase-negative staphylococci from Nigerian traditional fermented foods

Antimicrobial agents

Numbers of CoNS with MICa

Resistant isolates (%)

≤0.12

0.25

0.5

1

2

4

8

16

32

64

128

Ampicillin

24

13

11

62

55

27

0

0

43

18

2

218 (85.5%)

Trimethoprim–sulfomethoxazole

11

37

19

15

0

0

0

0

0

70

103

173 (67.8%)

Amoxicillin–clavulanic acid

101

0

27

0

0

0

0

0

0

40

87

127 (49.8%)

Oxacillin

53

136

0

0

0

47

0

0

19

0

0

66 (25.9%)

Ciprofloxacin

84

43

14

0

52

0

7

24

9

9

13

62 (24.3%)

Ofloxacin

21

12

22

69

121

0

0

0

0

0

10

10 (3.9%)

Gentamicin

15

151

16

26

10

0

21

7

0

0

0

37 (14.5%)

Erythromycin

98

91

15

0

0

0

0

6

0

40

0

46 (18.0%)

Cefotaximeb

0

181

20

0

0

49

0

0

0

3

2

–

  1. aBased on the CLSI breakpoints. MICs indicative for susceptible isolates are displayed on a white background, those for intermediate on a bold and those for resistant on a italics
  2. bSusceptility of staphylococci to cefotaxime may be detected from testing only penicillin and either cefoxitin or oxacillin