TABLE 3.

Distribution of rifampin MICs among the different rpoB alleles represented by at least five susceptible Neisseria meningitidis isolates (n = 325)

rpoB allelea	No. of isolates	MIC range (mg/liter)	MICgm (mg/liter)	95% Confidence interval (mg/liter)
rpoB1	32	0.047-0.5	0.225	0.173-0.294
rpoB2	36	0.004-0.75	0.057	0.032-0.10
rpoB4	98	0.003-1	0.089	0.066-0.12
rpoB5	21	0.004-0.5	0.061	0.031-0.18
rpoB9	27	0.003-0.75	0.065	0.033-0.128
rpoB18	54	0.003-0.5	0.024	0.015-0.036
rpoB27	8	0.015-0.5	0.15	0.052-0.43
rpoB28	11	0.004-0.25	0.025	0.011-0.058
rpoB31	11	0.004-0.06	0.015	0.008-0.027
rpoB34	10	0.006-0.75	0.029	0.009-0.0.93
rpoB40	17	0.008-0.12	0.034	0.023-0.051

^aOnly alleles that were represented by at least five isolates are mentioned.