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Table 1 Strain information and minimum inhibitory concentrations (MIC) of polymyxin B and resveratrol against bacterial isolates in this study

From: Resveratrol enhances the antimicrobial effect of polymyxin B on Klebsiella pneumoniae and Escherichia coli isolates with polymyxin B resistance

Isolate

Source

MIC

Polymyxin susceptibility and mechanism of resistance

Res

PB

PB in the presence of 32 μg/ml Res

PB in the presence of 64 μg/ml Res

PB in the presence of 128 μg/ml Res

Klebsiella pneumoniae

 1

human

512

16

8

4

2

mcr-1

 2

human

512

> 512

> 512

128

2

Uncharacterized

 3

human

512

8

2

2

2

Uncharacterized

 4

human

> 2048

4

2

1

1

Uncharacterized

 5

human

> 2048

4

2

1

1

Uncharacterized

 6

human

512

> 512

> 512

256

8

Uncharacterized

 7

human

1024

8

2

2

2

Uncharacterized

 8

human

> 2048

> 512

256

16

1

Uncharacterized

 9

human

2048

4

1

0.5

1

Uncharacterized

 10

human

2048

4

1

1

1

Uncharacterized

 11

human

512

4

2

2

1

Uncharacterized

 12

human

> 2048

16

1

1

1

Uncharacterized

 13

human

2048

4

2

0.5

1

Uncharacterized

 14

human

2048

4

2

1

1

Uncharacterized

 15

human

2048

16

4

2

1

Uncharacterized

 16

human

2048

32

4

4

0.5

Uncharacterized

 17

human

2048

64

16

4

1

Uncharacterized

 18

human

512

4

1

0.5

0.5

Uncharacterized

 19

human

> 2048

4

1

0.5

0.5

Uncharacterized

 20

human

512

256

128

32

1

Uncharacterized

 21

human

2048

16

2

2

0.5

Uncharacterized

 22

human

> 2048

2

0.5

0.5

1

Susceptible

 23

human

512

2

1

0.5

1

Susceptible

 24

human

2048

2

2

0.5

0.5

Susceptible

 25

human

> 2048

2

1

0.5

1

Susceptible

 26

human

> 2048

2

1

1

1

Susceptible

Escherichia coli

 27

animal

> 2048

4

2

2

1

mcr-1

 28

animal

> 2048

4

2

2

1

mcr-1

 29

animal

2048

> 512

64

8

4

mcr-1

 30

animal

> 2048

4

2

2

1

mcr-1

 31

animal

> 2048

4

2

2

1

mcr-1

 32

animal

> 2048

> 512

> 512

256

32

mcr-1

 33

animal

> 2048

4

2

2

1

mcr-1

 34

animal

> 2048

4

2

2

1

mcr-1

 35

animal

2048

4

4

2

1

mcr-1

 36

animal

> 2048

4

2

2

1

mcr-1

 37

animal

> 2048

4

2

2

1

mcr-1

 38

animal

> 2048

4

2

2

1

mcr-1

 39

animal

> 2048

> 512

> 512

128

8

mcr-1

 40

animal

2048

32

16

4

1

mcr-1

 41

animal

> 2048

4

2

2

1

mcr-1

 42

animal

> 2048

4

2

2

1

mcr-1

 43

animal

> 2048

> 512

> 512

256

2

mcr-1

 44

animal

> 2048

4

2

2

0.5

mcr-1

 45

animal

2048

64

4

4

0.5

mcr-1

 46

animal

> 2048

4

2

2

0.5

mcr-1

 47

human

2048

4

1

0.5

0.5

mcr-1

 48

human

> 2048

4

2

1

1

mcr-1

 49

animal

2048

32

8

2

1

Uncharacterized

 50

human

2048

2

2

1

1

Susceptible

  1. PB Stands for polymyxin B and Res stands for resveratrol