forty-one strains of streptococcus mutans ( 34 from blood specimens from patients with endocarditis and 7 from stock cultures ) were tested for susceptibility to penicillin , ampicillin , methicillin , erythromycin , cephalothin , vancomycin , chloramphenicol , tetracycline , gentamicin , streptomycin , and kanamycin .
C0030842
penicillin
C0025643
methicillin