Molecular characterization of macrolide- and multidrug-resistant Streptococcus pyogenes isolated from adult patients in Barcelona, Spain (1993-2008)

The Journal of Antimicrobial Chemotherapy
C ArdanuyJ Liñares

Abstract

The increase in erythromycin resistance among Streptococcus pyogenes isolates is a cause for concern. We analysed trends in macrolide resistance, phenotypes, genotypes, resistance determinants and transposons among erythromycin-resistant S. pyogenes isolates collected from adults in a Barcelona hospital (1993-2008). Antibiotic susceptibility was studied by microdilution. Molecular typing was performed by PFGE, emm typing and multilocus sequence typing (MLST). Macrolide resistance genes and those related to the Tn916 family of transposons were detected by PCR. Ninety-nine (18.3%) of 541 isolates were erythromycin resistant. Erythromycin resistance rates progressively increased from 0% (0/24) in 1993-1994 to 34.2% (50/146, P < 0.001) in 2001-2004, then falling to 7.4% (8/108, P = 0.02) in 2007-2008. Sixty-six erythromycin-resistant isolates were available for molecular studies. Of these, 26 had an M phenotype [mef(A)] and 40 had an MLS(B) phenotype [erm(B), n = 33; and erm(TR), n = 7]. Among M-phenotype isolates, the most frequent genotypes (88.5%) were emm4-ST39, emm6-ST382 and emm75-ST49, whereas genotypes emm11-ST403, emm28-ST52 and emm25-ST350 accounted for 72.5% of MLS(B)-phenotype isolates. Twenty-five isolates harboured bo...Continue Reading

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