TABLE 2.

Subinhibitory concentrations of antibiotics alter ST258 survival in NHS

Antibiotic	Change in survival of isolatea:
	34422	26598	30678	34576	34446	34473	34505	27386	27329	35106
Ceftazidime
Ciprofloxacin
Colistin	−		+	−		−		−
Doxycycline	+		+				+
Erythromycin							+	−
Linezolid
Meropenem
Mupirocin	+	+			+		+	+	+	+
Rifampin	−			+					+
Gentamicin							+
Tigecycline	+	+
Vancomycin

^aST258 clinical isolates were exposed to subinhibitory concentrations of the indicated antibiotics and then incubated in 90% NHS for 30 min as described in Materials and Methods. +, survival increased significantly compared to untreated control; −, survival decreased significantly compared to untreated control. Unmarked table cells indicate no significant change in survival compared to bacteria not pretreated with antibiotics (untreated control).