万古霉素分别联合三种抗菌药物对异质性万古霉素中介金黄色葡萄球菌耐药突变选择窗的影响
[Abstract]:Objective to investigate the effect of vancomycin combined with rifampicin, levofloxacin and fexatidic acid on the mutagenic window of (hVISA) resistance in heterogeneous vancomycin mediated Staphylococcus aureus. Methods six strains of methicillin-resistant Staphylococcus aureus (MRSA) were screened out of 115 strains of methicillin-resistant Staphylococcus aureus by the method of microflora analysis curve, and 6 strains of hVISA, were screened by E-test in vitro to determine the minimum inhibitory concentration of hVISA and standard strain Mu3 on vancomycin (MIC),. Agar plate dilution assay to determine the concentration of vancomycin single drug, combined rifampicin, levofloxacin, and fusidic acid in three antimicrobial agents (MPC), calculated the selection index (SI),) before and after the combination. According to the change of selection index, the effect of vancomycin combined with other antimicrobial agents on hVISA resistance mutation window was observed. Results the MPC values of vancomycin alone for 6 hVISA and Mu3 standard strains were 64256 渭 g / ml ~ (-1) and 64 ~ (256) 渭 g / ml ~ (-1), respectively. The MPC values of vancomycin combined with rifampicin, levofloxacin and fulcetic acid for 6 hVISA and Mu3 standard strains were 32 ~ 64 渭 g / ml ~ (32) 渭 g / ml ~ (32) g/ml and ~ (16) 渭 g / ml ~ (-1) / ml ~ (-1) of 816 渭 g / ml ~ (-1), respectively. Compared with vancomycin alone, SI decreased by 8 times, 2 times and 16 times, respectively. Conclusion the vancomycin single drug can reduce the MPC and SI, window of hVISA and reduce the window of MPC and SI, resistance of hVISA. It is easy to screen out the resistant mutant strains because the single vancomycin has higher MPC and wider window of mutation selection than vancomycin, and vancomycin combined with other antimicrobial agents can effectively reduce the MPC and SI, of hVISA. To reduce the production of drug resistant mutants, the effect of combination of fusidic acid is more obvious.
【作者单位】: 山东省滨州市人民医院呼吸内科;
【基金】:山东省医药卫生发展计划资助项目(2014WS0310)
【分类号】:R446.5
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