discs from oxoid and mast gave zones 1-5 mm larger than discs from other manufacturers with penicillin 2 units , ampicillin 10 mug , cephalothin 30 mug , methicillin 10 mug , carbenicillin 100 mug , erythromycin 15 mug , chloramphenicol 50 mug , and trimethoprim 1-25 mug , while discs containing aminoglycoside antibiotics , lincomycin , fusidic acid , tetracycline , nalidixic acid , penicillin 10 units , and polymyxin b gave similar zone sizes whatever the source .
C0006976
carbenicillin
C0030842
penicillin