Comparative antimicrobial susceptibility of aerobic and facultative bacteria from community-acquired bacteremia to ertapenem in Taiwan

Table 1 MIC(μg/ml) breakpoints of susceptibility for each type of bacteria

MIC Breakpoint of Susceptibility (μg/ml)
Type of bacteria /Antibiotic	FEP	FOX	CAZ	CRO	ERT	PIP	TAZO	CIP	AN	GM
Staphylococci	≦8	≦8	≦8	≦8	≦2	≦16	≦8/4	≦1	≦16	≦4
Streptococci	≦1	≦8	≦8	≦8	≦1		≦8/4	≦1
Enterococci	≦8				**		≦8/4	≦1
Enterobacteriaceae	≦8	≦8	≦8	≦8	≦2	≦16	≦16/4	≦1	≦16	≦4
Non-fermenters	≦8	≦8	≦8	≦8	≦2	≦16	≦16/4*	≦1	≦16	≦4

FEP = cefepime, FOX = cefoxitin, CAZ = ceftazidime, CRO = ceftriaxone, ERT = ertapenem, PIP = piperacillin, TAZO = piperacillin-tazobactam, CIP = ciprofloxacin, AN = amikacin GM = gentamicin, MIC = minimal inhibitory concentrations, ≤ indicates less than or equal to.
* For P. aeruginosa, MIC susceptibility breakpoint of piperacillin-tazobactam is ≦64/4 μg/ml.
** There are no proposed breakpoints for ertapenem against enterococci. In this present study, ≦2 μg/ml was used as breakpoint for ertapenem against enterococci.

ISSN: 1471-2334