Skip to main content

Table 2 Antimicrobial susceptibility results of PB-resistant K. pneumoniae and the E. coli transconjugants and substitution mutations of chromosomal regulators in PB-resistant isolates

From: Clonal transmission of polymyxin B-resistant hypervirulent Klebsiella pneumoniae isolates coharboring blaNDM-1 and blaKPC-2 in a tertiary hospital in China

 

Minimum inhibitory concentrations (μg/mL)

Mutations of chromosomal regulators

Strain

Category

CAZ

FEP

CZA

ATM

TZP

NIT

IPM

MEM

AMK

LVX

TGC

PB

mgrB

phoQ

pmrB

KP14

XDR

64

> 128

≤ 1/4

> 128

> 512/4

512

> 32

> 32

> 512

> 16

1

> 16

-

D150G

R256G

KP16

MDR

> 128

> 128

≤ 1/4

> 128

> 512/4

256

32

32

≤ 4

16

0.5

16

-

D150G

R256G

KP17

XDR

> 128

> 128

> 128/4

> 128

> 512/4

256

> 32

> 32

> 512

> 16

0.5

16

-

D150G

T157P, R256G

KP18

XDR

64

> 128

≤ 1/4

> 128

> 512/4

512

> 32

> 32

> 512

> 16

1

> 16

ISKpn74

D150G

R256G

KP20

XDR

128

> 128

1

> 128

> 512/4

256

> 32

> 32

> 512

16

0.5

16

-

D150G

S85R, R256G

KP21

XDR

> 128

> 128

> 128/4

> 128

> 512/4

128

> 32

> 32

> 512

> 16

1

16

-

D150G

T157P, R256G

KP24

XDR

> 128

> 128

> 128/4

> 128

> 512/4

512

> 32

> 32

> 512

> 16

2

> 16

IS903B

D150G

R256G

KP25

XDR

> 128

> 128

> 128/4

> 128

> 512/4

256

> 32

> 32

> 512

16

0.5

16

-

D150G

T157P, R256G

EC600

-

≤ 1

≤ 1

≤ 1/4

≤ 1

8/4

8

≤ 0.25

≤ 0.25

≤ 4

≤ 0.125

≤ 0.125

0.5

-

-

-

KP17-T

MDR

> 128

64

> 128/4

≤ 1

256/4

8

16

16

> 512

≤ 0.125

≤ 0.125

0.5

-

-

-

KP21-T

MDR

> 128

64

> 128/4

≤ 1

512/4

8

8

16

> 512

0.25

≤ 0.125

0.5

-

-

-

KP25-T

MDR

> 128

32

> 128/4

≤ 1

256/4

8

16

16

> 512

≤ 0.125

≤ 0.125

0.5

-

-

-

  1. KP17-T, KP21-T, KP25-T, Transconjugants
  2. Abbreviations: CAZ Ceftazidime, FEP Cefepime, CZA Ceftazidime/avibactam, ATM Aztreonam, TZP Piperacillin/tazobactam, NIT Nitrofurantoin, IPM Imipenem, MEM Meropenem, AMK Amikacin, LVX Levofloxacin, TGC Tigecycline, PB Polymyxin B