Annals of Laboratory Medicine

Korean Society for Laboratory Medicine (대한진단검사의학회)
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Detection of the Efflux-Mediated Erythromycin Resistance Transposon in Streptococcus pneumoniae

  • Azadegan, Azadeh (Department of Microbiology, School of Medicine, Tehran University of Medical Sciences) ;
  • Ahmadi, Ali (Applied Microbiology Research Center, Baqiyatallah University of Medical Sciences) ;
  • Lari, Abdolaziz Rastegar (Department of Medical Microbiology, School of Medicine, Iran University of Medical Sciences) ;
  • Talebi, Malihe (Department of Medical Microbiology, School of Medicine, Iran University of Medical Sciences)
  • Received : 2014.03.21
  • Accepted : 2014.08.27
  • Published : 2015.01.02
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Abstract

Background: The present analysis focuses on phenotypic and genotypic characterizations of efflux-mediated erythromycin resistance in Streptococcus pneumoniae due to an increase in macrolide resistance in S. pneumoniae worldwide. Methods: We investigated the prevalence of efflux-mediated erythromycin resistance and its relevant genetic elements from 186 specimens of S. pneumonia isolated from clinical and normal flora from Tehran, Iran. The presence of erythromycin resistance genes was tested by PCR with two sets of primers, specific for erm(B) and mef(A/E), and their genetic elements with tetM, xis, and int genes. Isolates were typed with the BOX PCR method and tested for resistance to six antibiotics. Results: Antibiotic susceptibility tests revealed that 100% and 47% isolates were resistant to tetracycline and erythromycin, respectively. The erythromycin and clindamycin double-disc diffusion test for macrolide-lincosamide-$streptogramin_B$ ($MLS_B$) resistance phenotype showed 74 (84%) isolates with the constitutive $MLS_B$ phenotype and the remaining with the M phenotype. BOX PCR demonstrated the presence of 7 types in pneumococci with the M phenotype. Fourteen (16%) isolates with the M phenotype harbored mef(A/E), tetM, xis, and int genes. Conclusion: The present results suggest dissemination of polyclonal groups of S. pneumoniae with the M phenotype carrying resistance genes attributed to transposon 2009.

Keywords

Acknowledgement

Supported by : Iran University of Medical Sciences

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