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Detection of Mutation in 23S rRNA in Isolates of Streptococcus pyogenes Resistant to Erythromycin

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Author(s): Z Sepehrizadeh | G Zarrini | M Bahrololoumi Shapourabadi | M Tabatabaei Yazdi | M Hosseini shad

Journal: Iranian Journal of Public Health
ISSN 2251-6085

Volume: 37;
Issue: 4;
Start page: 114;
Date: 2008;
Original page

Keywords: Streptococcus pyogenes | 23S rRNA | erythromycin-resistance

ABSTRACT
"nBackground: In this study, erythromycin resistance isolates from the students with aged 12-15 yr old were studied and the mutations in the 23S rRNA were identified by sequencing."nMethods: Throat samples of 327 students with 12-15 years old from 3 schools of Tehran were cultured on the selective Strep­tococ­cus pyogenes medium and 23 strains were primarily selected as S. pyogenes."nResults: All strains were susceptible to penicillin and bacitracin (0.04U). Minimum inhibitory of concentrations (MICs) for eryth­romycin were determined in which 5 strains were found intermediate, 2 strains resistance and the remaining 16 strains susceptible to erythromycin. MIC for the erythromycin-resistance strains, BT3 and BT4, were 8.2 and 12.4 µg/ml, respec­tively. PCR was performed for each six 23S rRNA operons and a fragment with 550 bp was sequenced. For two resis­tance strains, BT3 and BT4 there were a mutation in position 2059 (A to G). Also another mutation in position 2529 (G to A) was detected in BT3."nConclusion: In addition to mutation at the position 2058 other point mutations in different positions of domain V involve in the resistance to macrolides. 
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