Evaluation of resistance mechanisms and serotype and genotype distributions of macrolide-resistant strains in clinical isolates of Streptococcus pneumonia in Ayd谋n, Turkey
| 详细信息 | 推荐本文 | |
- 作者：Murat Telli (1) mutelli@hotmail.com
Mete Eyig枚r (1)
Berna G眉ltekin (1)
Neriman Ayd谋n (1) - 关键词：Macrolide resistance – ; Serotype – ; Streptococcus pneumoniae
- 刊名：Journal of Infection and Chemotherapy
- 出版时间：October 2011
- 出版年：2011
- 期刊代码：126_1341-321X
- 类别：med
- 卷：17
- 期：5
- 页码：658-664
- 数据来源：sp
摘要
Macrolide resistance mechanisms in 89 Streptococcus pneumoniae strains isolated from several clinical samples between February 2007 and May 2009 were investigated. Erythromycin resistance was noted in 35 (40%) S. pneumoniae strains. In these strains, the most frequent resistance phenotype was cMLSB (74%), and the most frequent resistance genotype was ermB (82%). Both ermB and mefA genes were positive in 20%of macrolide-resistant strains. While no resistance to vancomycin, linezolid and telithromycin was noted in 89 S. pneumoniae strains, 12 (13%) strains were penicillin resistant, 26 (30%) strains were clindamycin resistant, 35 (40%) were azithromycin resistant, 32 (36%) strains were tetracycline resistant, and 1 (1%) strain was levofloxacin resistant. The serotype distribution of 35 macrolide-resistant S. pneumoniae strains revealed that the most frequent serotype was serogroup 19 (45%). Multidrug resistance was present in 19 (86%) of 22 strains carrying only the ermB resistance gene. No clonal dissemination was noted in the macrolide-resistant pneumococcal strains. These findings suggest that macrolide resistance rates, resistance phenotype and genotype, as well as resistant serotypes of S. pneumoniae strains should be continuously monitored in our country.