Table 1. A list of antimicrobial agents, their subclasses, MIC range, and breakpoints for susceptibility testing

Antimicrobial subclass	Antimicrobial agents (Abbreviation)	Range tested (μg/mL)	Breakpoints (μg/mL)	References
Aminoglycosides	Gentamicin (GEN)	1–32	≥16	CLSI1)
	Kanamycin (KAM)	4–64	≥64	CLSI2)
Ansamycins	Rifampin (RIF)	0.016–0.5	≥4	CLSI1)
Penicillin	Penicillin (PEN)	0.12–2	≥0.25	CLSI1)
Cephamycin	Cefoxitin (FOX)	0.5–16	≥8	CLSI1)
Fluoroquinolone	Ciprofloxacin (CIP)	0.25–8	≥4	CLSI1)
Glycopeptide	Vancomycin (VAN)	1–16	≥16	CLSI1)
Macrolides	Erythromycin (ERY)	0.25–8	≥8	CLSI1)
Oxazolidinones	Linezolid (LNZ)	1–8	≥8	CLSI1)
Folate pathway inhibitors	Sulfamethoxazole (SMX)	64–512	≥512	CLSI1)
	Trimethoprim (TMP)	2–32	≥16	CLSI1)
Lincosamides	Clindamycin (CLI)	0.12–4	≥4	CLSI1)
Phenicols	Chloramphenicol (CHL)	4–64	≥32	CLSI1)
Pseudomonic acid	Mupirocin (MUP)	0.5–256	>256	EUCAST3)
Streptogramins	Quinupristin/dalfopristin (SYN)	0.5–4	≥4	CLSI1)
Tetracyclines	Tetracycline (TET)	0.5–16	≥161)	CLSI1)
Others	Fusidate (FUS)	0.5–4	≥22)	EUCAST4)

Clinical Laboratory Standards Institute, M100, 29^th ed. 2019.
Clinical Laboratory Standards Institute, M100, 27^th ed. 2017.
The European Committee on Antimicrobial Susceptibility testing, 2016.
The European Committee on Antimicrobial Susceptibility testing, 2017.
MIC, minimum inhibitory concentration; CLSI, Clinical and Laboratory Standards Institute; EUCAST, European Committee on Antimicrobial Susceptibility Testing.