Table 1. Distribution of the sul and dfrA genes in 41 sul2-positive Stenotrophomonas maltophilia isolates.

Gene	N of isolates	MIC of SXT (µg/mL)
		0.25/4.95	1/19	2/38	4/76	8/152	16/304	32/608	> 32/608
sul2	13	1	6	4	2
sul2, sul1	10				2			1	7
sul2, sul1, dfrA12	8						3	1	4
sul2, sul1, dfrA17	10					1	1	3	5

Abbreviations: MIC, minimal inhibitory concentration; SXT, trimethoprim/sulfamethoxazole.