The antimicrobial susceptibility of Stenotrophomonas maltophilia isolates using three different methods and their genetic relatedness

Table 1 Susceptibility of S. maltophilia obtained by the three methods studied (N = 52)

	Percentage susceptibility*			Agar MIC (mg/L)
Agent	Disc diffusion	E Test	Agar dilution (MIC breakpoint)	MIC₅₀	MIC₉₀	MIC Range
Ceftazidime	67.3	63.5	50.0 (≤ 8 mg/L)	8	256	0.25->256
Cefepime	30.8	42.3	34.6 (≤ 8 mg/L)	16	64	1–64
Piperacillin	34.6	15.4	26.9 (≤ 16 mg/L)	64	256	1->256
PTZ	61.5	46.2	42.3 (≤ 16/4 mg/L)	32/4	128/4	4/4->256/4
TLc	84.6	90.4	73.1 (≤ 16/2 mg/L)	8/2	64/2	0.5/2->256/2
Ciprofloxacin	92.3	92.3	53.8 (≤ 1 mg/L)	1	4	0.5–16
SXT	98.1	98.1	98.1 (≤ 2/38 mg/L)	0.5/9.5	1/19	0.125/2.375- 128/2432

PTZ: Piperacillin/tazobactam, TLc: Ticarcillin/clavulanate, SXT: Trimethoprim/sulfamethoxazol

ISSN: 1471-2180