Development of a Novel Test for Simultaneous Bacterial Identification and Antibiotic Susceptibility

Table 1

Detection of GBS following 9-hour incubation in the presence of erythromycin and dilutions of clindamycin. Isolate A (noninducible resistance to clindamycin) compared with isolate B (inducible resistance capable). ++++ OD > 3.0. +++ OD 2.0–2.9. ++ OD 1.0–1.9. + OD 0.1–0.9. − OD 0–0.099.

	10^7 bacteria/mL		10^6 bacteria/mL		10^5 bacteria/mL		10^4 bacteria/mL
	Isolate A	Isolate B	Isolate A	Isolate B	Isolate A	Isolate B	Isolate A	Isolate B
Clindamycin 0 μg/mL; Erythromycin 1.0 μg/mL	++++	++++	++++	++++	++++	++++	++++	+++
Clindamycin 0.5 μg/mL; Erythromycin 1.0 μg/mL		++++		++		+		+
Clindamycin 0.05 μg/mL; Erythromycin 1.0 μg/mL		++++		+++		+		+
Clindamycin 0.005 μg/mL; Erythromycin 1.0 μg/mL		++++		+++		+		+