TABLE 2.

β-Lactam resistance of B. ubonensis Bu278 complemented mutants

Strain	Relevant genotype	MIC (μg/ml)a
		MEM		IMP		CAZ		AMX
		−Ara	+Ara	−Ara	+Ara	−Ara	+Ara	−Ara	+Ara
Bu338	Bu278::mini-Tn7-PBAD	≥32	≥32	≥32	≥32	8	12	≥256	≥256
Bu352	Bu308::mini-Tn7-PBAD	2	2	4	4	2	2	≥256	≥256
Bu373	Bu308::mini-Tn7-PBAD- nagZ+	≥32	≥32	≥32	≥32	4	16	≥256	≥256
Bu356	Bu296::mini-Tn7-PBAD	1.5	2	6	6	1.5	2	≥256	≥256
Bu375	Bu296::mini-Tn7-PBAD-slt+	≥32	≥32	≥32	≥32	4	24	≥256	≥256
Bu382	Bu312::mini-Tn7	0.75	NA	0.19	NA	2	NA	192	NA
Bu379	Bu312::mini-Tn7-PpenB- penBBu278+	≥32	NA	≥32	NA	8	NA	≥256	NA

^aThe MIC was determined using the Etest method, performed in triplicate on three separate days, and values are reported as the mode of the readings. −Ara, medium without l-arabinose; +Ara, medium with l-arabinose at a final concentration of 1%. NA, not applicable.