Table 3

Comparison of MIC₅₀, MIC₉₀, MICmean of the four antibiotics to N gonorrhoeae isolated in Guangzhou during 1996–2001 (μg/ml)

Year	No	Penicillin				Spectinomycin				Ceftriaxone				Ciprofloxacin
Year	No	Range	MIC₅₀	MIC₉₀	MICmean	Range	MIC₅₀	MIC₉₀	MICmean	Range	MIC₅₀	MIC₉₀	MICmean	Range	MIC₅₀	MIC₉₀	MICmean
192 strains were tested for ceftriaxone and 199 for ciprofloxacin, mean = geometric mean MIC.
1996	201*	16–0.016	1	4	0.68	64–1	8	16	6.80	0.5–0.002	0.031	0.25	0.03	2–0.002	0.1 2	2	0.14
1997	51	16–0.008	1	4	1.01	32–8	16	16	15.36	0.5–0.004	0.031	0.06	0.02	16–0.008	1	8	1.19
1998	203	16–0.125	2	4	1.59	64–4	16	32	16.67	0.25–0.002	0.031	0.06	0.04	16–0.016	4	16	1.30
1999	167	32–0.004	2	16	2.09	32–2	16	16	13.27	0.25–0.002	0.016	0.02	0.02	32–0.002	4	32	2.62
2000	61	>32–0.06	1	32	1.74	16–4	8	16	8.96	0.25–0.002	0.031	0.06	0.021	32–0.06	1	4	1.24
2001	110	>32–0.03	2	32	2.35	16–4	8	16	8.79	0.25–0.002	0.015	0.06	0.018	32–0.03	2	8	1.44