TABLE 1.

The result of MIC by using VITEK-2.

Category	Antimicrobial agent			MIC (mg/L)/Antimicrobial susceptibility
		EC600	RB20432	RB20432-mcr-1-EC600	DB20D28	DB20D28-mcr-1-EC600
Penicillin	Ampicillin	8/S	≥256/R	≥256/R	≥256/R	≥256/R
	Amoxicillin	≤4/S	≥256/R	≥256/R	≥256/R	≥256/R
β-lactam	Ceftazidime	≤4/S	≤4/S	≤4/S	≤4/S	≤4/S
	Imipenem	≤1/S	≥16/R	≤1/S	≤1/S	≤1/S
Colistin	Polymyxin B	≤0.5/ S	≥8/R	≥8/R	4/I	≥8/R
Tetracycline	Tetracycline	4/S	≥128/R	≥128/R	≥128/R	≥128/R
Aminoglycosides	Kanamycin	8/S	≥128/R	32/I	≥64/R	≥64/R
	Azithromycin	8/S	≥128/R	≥64/R	≤4/S	≤4/S
	Gentamicin	≤1/S	≥16/R	8/I	≤1/S	≤1/S
Quinolines	Ciprofloxacin	≤0.25/S	≥4/R	≥4/R	≤0.25/S	≤0.25/S
Sulfonamides	Sulfamethoxazole	≤20/S	≥320/R	≥320/R	≥320/R	≥320/R

S, susceptible; R, resistant; I, intermediate.