TABLE 1.

MICs for the wild-type and mutant N. meningitidis strains^a

Antibiotic	MIC (μg/ml)
	¢9	¢9ΔPorA	¢9ΔPorB
Cefotaxime	0.003125	0.003125	0.00625
Ceftazidime	0.03125	0.03125	0.0625
Cephalothin	0.3125	0.3125	0.625
Ampicillin	0.0625	0.0625	0.0625
Carbenicillin	0.0625	0.0625	0.0625
Cloxacillin	1.25	1.25	1.25
Penicillin G	0.03125	0.03125	0.03125
Piperacillin	0.03125	0.03125	0.015625
Tetracycline	0.3125	0.3125	0.625
Doxycycline	0.1875	0.1875	0.375
Ciprofloxacin	0.003125	0.003125	0.00625
Nalidixic acid	1.25	1.25	1.25
Imipenem	0.0625	0.0625	0.0625
Rifampin	0.125	0.125	0.0625

^aMICs are reported as the last well in which turbidity was observed. Bold indicates reduced susceptibility of ¢9ΔPorB.