MICs 90 (mcg/ml) were 0.03 for erythromycin, ketolide HMR 3647 and ciprofloxacin, 0.06 for josamycin, 0.25 for spiramycin, roxithromycin and rifampicin, 0.5/2.5 for cotrimoxazole, and 1 for amoxicillin.