First Report of Klebsiella pneumoniae-Carbapenemase-3-Producing Escherichia coli ST479 in Poland

Table 1

MIC values of antimicrobial agents tested for E. coli 140 2594-2 and results of PCRs for bla genes.

Antimicrobial agents	MIC [g/mL]
	Diffusion test with use of -tests	VITEK 2 automated system and AST-N259 card
Amikacin	R 96	R ≥ 64
Amoxicillin/clavulanic acid	N	R ≥ 32
Cefepime	I 4	I 2
Piperacillin/tazobactam	R > 256	R ≥ 128
Cefuroxime	N	R ≥ 64
Cefotaxime	N	R 2
Ceftazidime	R > 256	R 32
Colistin	S 0.38	S ≤ 0.5
Ertapenem	R 8	R 4
Gentamicin	R 16	I 4
Tobramycin	N	R ≥ 16
Aztreonam	R 192	N
Imipenem	I 3	I 8
Meropenem	S 0.75	I 1
Doripenem	I 1.5	N
Tigecycline	S 1	S ≤ 0.5
Ciprofloxacin	N	R ≥ 4
Trimethoprim/sulfamethoxazole	N	R ≥ 320
Results of PCRs
Genes encoding carbapenemases	Genes encoding other -lactamases
-positive^*	-positive^**
-negative	-negative
-negative	-negative
-negative

R: resistant; S: susceptible; I: intermediate; ^*genes encoding β-lactamase type KPC-3, ^**genes encoding β-lactamase type TEM-34; N: not tested.