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Table 1 Molecular and phenotypic characterization of two TIG-resistant mutants and MRSA parental strains

From: In vitro selection of Staphylococcus aureus mutants resistant to tigecycline with intermediate susceptibility to vancomycin

Strains

Molecular characterization

MIC (μg/mL)

δ-hemolysin

SCC mec

ST

spa type

agr

group

OXA

FOX

VAN

TMS

RIF

CIP

GEN

CLI

TIG

TIG + RS

EB

EB + RS

OXA + RS

FOX + RS

VAN + RES

2028p

III

239

t654

I

≥32

≥128

1

≥32/608

≥16

≥16

≥64

≥8

0125

0.064

16

2

ND

ND

ND

+

2028m

III

239

t654

I

≥32

≥128

1

≥32/608

≥16

≥16

≥64

≥8

16

0.25

64

2

ND

ND

ND

+

94159p

IV

5

t002

II

8

16

1

0.5/9.5

4

0.5

≥64

≤0.25

0125

0.064

16

1

16

16

1

+

94159m

IV

5

t002

II

32

64

4

0.5/9.5

4

0.5

≥64

≤0.25

16

1

128

8

32

64

4

  1. p parental, m mutant, ST sequence type, OXA oxacillin, FOX cefoxitin, VAN vancomycin, TMS trimethoprim sulfamethoxazole, RIF rifampicin, GEN gentamicin, CLI clindamycin, TIG tigecycline, RS reserpine, EB ethidium bromide, ND not determined