TABLE 4.

Minimal inhibitory concentration (MIC) ranges (mg/L) of Neisseria gonorrhoeae reference strains *^†

Antibiotic	WHO B*	WHO C*	WHO F*	ATCC 49226†
Penicillin	0.032–0.125	0.25–1.0	0.008–0.032	0.25–1.0
Spectinomycin	16.0–32.0	16.0–32.0	16.0–32.0	8.0–32.0
Tetracycline	0.125–0.25	0.5–1.0	0.25–0.5	0.25–1.0
Erythromycin	0.063–0.125	0.5–1.0	0.5–1.0	1.0–2.0
Ceftriaxone	0.002–0.008	0.008–0.032	0.00025–0.001	0.004–0.016
Ciprofloxacin	0.002–0.008	0.002–0.008	0.002–0.008	0.001–0.008
Cefixime	0.004–0.016	0.008–0.032	0.0005–0.002	0.004–0.032
Azithromycin	0.032–0.063	0.063–0.125	0.125–0.25	0.5–1.0*

*MICs for the World Health Organization (WHO) strains were determined using GC medium base (Difco, USA) supplemented with 1% Kellogg's defined supplement. Ranges established by the National Microbiology Laboratory in Winnipeg, Manitoba. ^†Acceptable ranges of MICs as per National Committee for Clinical Laboratory Standards document M100-S13 (M7-A6), January 2003 (45)