benzylpenicillin ( 90.8 per cent of the sensitive strains ) , ampicillin ( 67.1 per cent ) , tetracycline ( 66.7 per cent ) , levomycetin ( 68.6 per cent ) and streptomycin ( 38.1 per cent ) were less effective .
C0030827
benzylpenicillin
C0002680
ampicillin