title: Comparative activity of ampicillin, amoxycillin, amoxycillin/clavulanate and cefotaxime against 189 penicillin-susceptible and -resistant pneumococci.
abstract: Agar dilution and E-test MICs of penicillin G, ampicillin, amoxycillin, amoxycillin/clavulanate and cefotaxime were determined against 189 pneumococci. Addition of clavulanate did not influence amoxycillin MICs, MIC50/MIC90 (mg/L) for penicillin G, ampicillin, amoxycillin and cefotaxime were: Penicillin susceptible strains (62): 0.03/0.03; 0.03/0.06; 0.015/0.03; 0.015/0.06. Penicillin intermediate strains (69): 0.25/1.0; 0.25/4.0; 0.125/1.0; 0.125/1.0. Penicillin resistant strains (58): 2.0/4.0; 4.0/4.0; 1.0/2.0; 1.0/2.0. E-test MICs correlated well with those obtained by agar dilution.
authors.affiliation: Department of Pathology, Clinical Microbiology, Hershey Medical Center, Hershey, PA 17033, USA.
authors.forename: G A
authors.initials: GA
authors.lastname: Pankuch
authors.forename: M R
authors.initials: MR
authors.lastname: Jacobs
authors.forename: P C
authors.initials: PC
authors.lastname: Appelbaum
mesh_terms: D000362:Agar; D000658:Amoxicillin / Q000494:pharmacology; D019980:Amoxicillin-Potassium Clavulanate Combination; D000667:Ampicillin / Q000494:pharmacology*; D002439:Cefotaxime / Q000494:pharmacology*; D002511:Cephalosporins / Q000494:pharmacology*; D002969:Clavulanic Acids / Q000494:pharmacology; D003470:Culture Media; D004359:Drug Therapy, Combination / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D010403:Penicillin Resistance; D010406:Penicillins / Q000494:pharmacology*; D013296:Streptococcus pneumoniae / Q000187:drug effects*
chemical_list: D002511:Cephalosporins; D002969:Clavulanic Acids; D003470:Culture Media; D010406:Penicillins; D019980:Amoxicillin-Potassium Clavulanate Combination; D000667:Ampicillin; D000658:Amoxicillin; D000362:Agar; D002439:Cefotaxime