Repository of Research and Investigative Information

Repository of Research and Investigative Information

Baqiyatallah University of Medical Sciences

Detection of the Efflux-Mediated Erythromycin Resistance Transposon in Streptococcus pneumoniae

(2015) Detection of the Efflux-Mediated Erythromycin Resistance Transposon in Streptococcus pneumoniae. Annals of Laboratory Medicine. pp. 57-61. ISSN 2234-3806

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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) (MLSB) resistance phenotype showed 74 (84) isolates with the constitutive MLSB 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.

Item Type: Article
Keywords: Erythromycin mef(A/E) Streptococcus pneumoniae molecular characterization invasive pneumococci multiplex pcr macrolide determinants mef(a) erm(b) mechanisms serotypes genotypes Medical Laboratory Technology
Page Range: pp. 57-61
Journal or Publication Title: Annals of Laboratory Medicine
Journal Index: ISI
Volume: 35
Number: 1
Identification Number:
ISSN: 2234-3806
Depositing User: مهندس مهدی شریفی

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