title: Antimicrobial susceptibilities of amoxycillin-non-susceptible and susceptible isolates among penicillin-non-susceptible Streptococcus pneumoniae.
abstract: Antimicrobial susceptibilities of 244 amoxycillin-non-susceptible and 81 amoxycillin-susceptible pneumococcal isolates from 15 Spanish hospitals were determined and clonal relationships were investigated by pulsed-field gel electrophoresis after SmaI restriction. Amoxycillin-non-susceptible isolates exhibited higher rates of resistance to cefuroxime, cefixime, cefpodoxime and clarithromycin, but not to levofloxacin and cefotaxime. Cefditoren exhibited MIC(90) values one dilution lower than those of cefotaxime. Higher numbers of the Spain(14)-5 and Spain(6B)-2 clones, but not the Spain(9V)-3 and Spain(23F)-1 clones, were found among amoxycillin-non-susceptible isolates. Spain(14)-5 was the most problematic clone in terms of antibiotic resistance.
authors.affiliation: Department of Microbiology, Hospital Donostia, San Sebastián, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Pérez-Trallero
authors.forename: J M
authors.initials: JM
authors.lastname: Marimón
authors.forename: M
authors.initials: M
authors.lastname: Ercibengoa
authors.forename: M J
authors.initials: MJ
authors.lastname: Giménez
authors.forename: P
authors.initials: P
authors.lastname: Coronel
authors.forename: L
authors.initials: L
authors.lastname: Aguilar
mesh_terms: D000658:Amoxicillin / Q000494:pharmacology*; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D018432:Drug Resistance, Multiple / Q000235:genetics*; D024901:Drug Resistance, Multiple, Bacterial; D008826:Microbial Sensitivity Tests; D010403:Penicillin Resistance; D010406:Penicillins / Q000494:pharmacology*; D011008:Pneumococcal Infections / Q000382:microbiology*; D013296:Streptococcus pneumoniae / Q000187:drug effects* / Q000302:isolation & purification
chemical_list: D000900:Anti-Bacterial Agents; D010406:Penicillins; D000658:Amoxicillin