Table 1.

Minimum inhibitory concentrations (MICs) of different antibiotic against A. baumannii K31.

Antibiotics	MICs (µg/mL)	MIC Break Points (µg/mL)
		S≤	R>
Aztreonam	64	N	N
Ciprofloxacin	32	0.25	0.5
Polymyxin B *	1	–	–
Tobramycin	256	4	4

S: susceptible; R: resistant; according to European Committee on Antimicrobial Susceptibility Testing (EUCAST) [27]. N: No breakpoints, and susceptibility testing is not recommended as the bacterial species is a poor target for therapy with this antibiotic (isolates may be reported as R without prior testing). * No breakpoints listed for polymyxin B, but colistin breakpoints are S ≤ 2 and R > 2 (PMB and colistin both belong to polymyxins group).