Identification and In Vitro Antimicrobial Susceptibility of Brucella Species Isolated from Human Brucellosis

Table 1

MIC range and MIC₅₀ and MIC₉₀ values of antimicrobial agents.

Antibiotic	Range (µg/mL)	MIC50 (µg/mL)	MIC90 (µg/mL)	Breakpoint for susceptibility (µg/mL)
Gentamicin	0.047–0.94	0.125	0.19	≤4^a
Streptomycin	0.125–1	0.5	0.75	≤8^a
Cotrimoxazole	0.004–0.25	0.047	0.125	≤2^a
Doxycycline	0.032–1	0.125	0.25	≤1^a
Tetracycline	0.023–0.64	0.065	0.19	≤1^a
Rifampicin	0.38–2	1.5	1	≤1^b

aClinical and Laboratory Standards Institute (CLSI), 2013. Method for Antimicrobial Dilution and Disk Susceptibility testing of Infrequently Isolated or fastidious Bacteria, Second Edition, M45-A2 [12]. ^bClinical and Laboratory Standards Institute (CLSI), 2014. Method for Antimicrobial Dilution and Disk Susceptibility Testing of Haemophilus influenzae, M100-S24 [13].