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. 2001 Mar;45(3):789-93.
doi: 10.1128/AAC.45.3.789-793.2001.

In vitro activities of the novel ketolide telithromycin (HMR 3647) against erythromycin-resistant Streptococcus species

J Jalava  1 , J Kataja, H Seppälä, P Huovinen
Affiliations

In vitro activities of the novel ketolide telithromycin (HMR 3647) against erythromycin-resistant Streptococcus species

J Jalava et al. Antimicrob Agents Chemother. 2001 Mar.

Abstract

The in vitro susceptibilities of 184 erythromycin-resistant streptococci to a novel ketolide, telithromycin (HMR 3647), were tested. These clinical isolates included 111 Streptococcus pyogenes, 18 group C streptococcus, 18 group G streptococcus, and 37 Streptococcus pneumoniae strains. The MICs for all but eight S. pyogenes strains were < or =0.5 microg/ml, indicating that telithromycin is active in vitro against erythromycin-resistant Streptococcus strains. All strains for which MICs were > or =1 microg/ml had an erm(B) resistance gene and six strains for which MICs were > or =4 microg/ml had a constitutive erm(B) gene (MIC range, 4 to 64 microg/ml). Interestingly, for S. pneumoniae strains with a constitutive erm(B) gene, MICs were < or =0.25 microg/ml (MIC range, < or =0.008 to 0.25 microg/ml). Our in vitro data show that for S. pyogenes strains which constitutively express the erm(B) methylase gene, MICs are so high that the strains might be clinically resistant to telithromycin.

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Figures

FIG. 1
FIG. 1
Distribution of macrolide resistance genes of S. pyogenes (A), GCS (B), GGS (C), and S. pneumoniae (D) strains according to telithromycin MICs Abbreviations: ERY, erythromycin; c, constitutive; i, inducible; erm, erythromycin ribosome methylation genes; mef, macrolide efflux genes. See text for details of the novel resistance phenotype.
FIG. 1
FIG. 1
Distribution of macrolide resistance genes of S. pyogenes (A), GCS (B), GGS (C), and S. pneumoniae (D) strains according to telithromycin MICs Abbreviations: ERY, erythromycin; c, constitutive; i, inducible; erm, erythromycin ribosome methylation genes; mef, macrolide efflux genes. See text for details of the novel resistance phenotype.
FIG. 1
FIG. 1
Distribution of macrolide resistance genes of S. pyogenes (A), GCS (B), GGS (C), and S. pneumoniae (D) strains according to telithromycin MICs Abbreviations: ERY, erythromycin; c, constitutive; i, inducible; erm, erythromycin ribosome methylation genes; mef, macrolide efflux genes. See text for details of the novel resistance phenotype.
FIG. 1
FIG. 1
Distribution of macrolide resistance genes of S. pyogenes (A), GCS (B), GGS (C), and S. pneumoniae (D) strains according to telithromycin MICs Abbreviations: ERY, erythromycin; c, constitutive; i, inducible; erm, erythromycin ribosome methylation genes; mef, macrolide efflux genes. See text for details of the novel resistance phenotype.
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