Table 1 Antimicrobial susceptibility of mcr-1-positive Salmonella strains isolated from different sources.

From: Distinct mechanisms of acquisition of mcr-1 –bearing plasmid by Salmonella strains recovered from animals and food samples

Antibiotics

Break-point (µg/ml)

% resistance

Food isolates

 

WT (n = 15)

TC (n = 15)

Animal isolates (n = 26)

Ampicillin

≥32

94

94

100

Amoxicillin/Clavulanic acid

≥32/16

13

13

62

Ceftriaxone

≥4

13

13

0

Ceftazidime

≥4

13

13

0

Cefotaxime

≥4

13

13

0

Meropenem

≥4

13

13

0

Chloramphenicol

≥32

75

13

96

Gentamicin

≥16

31

26

100

Nalidixic acid

32

38

0

96

Ciprofloxacin

≥1

25

0

100

Trimethoprim/ Sulfamethoxazole

≥4/76

44

17

96

Tetracycline

≥16

100

0

100

*Colistin

≥4

100

100

100

Azithromycin

≥16

0

0

0

  1. WT, wild type; TC, transconjugants;
  2. *there is no CLSI breakpoint for colistin in Enterobacteriaceae. The forthcoming 2017 CLSI guideline proposed it to be 4 µg/ml.
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