Antimicrobial susceptibilities of amoxycillin-non-susceptible and susceptible isolates among penicillin-non-susceptible Streptococcus pneumoniae

Clin Microbiol Infect. 2007 Sep;13(9):937-40. doi: 10.1111/j.1469-0691.2007.01777.x. Epub 2007 Jul 6.

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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amoxicillin / pharmacology*
  • Anti-Bacterial Agents / pharmacology*
  • Drug Resistance, Multiple / genetics*
  • Drug Resistance, Multiple, Bacterial
  • Microbial Sensitivity Tests
  • Penicillin Resistance
  • Penicillins / pharmacology*
  • Pneumococcal Infections / microbiology*
  • Streptococcus pneumoniae / drug effects*
  • Streptococcus pneumoniae / isolation & purification

Substances

  • Anti-Bacterial Agents
  • Penicillins
  • Amoxicillin