萬(wàn)古霉素分別聯(lián)合三種抗菌藥物對(duì)異質(zhì)性萬(wàn)古霉素中介金黃色葡萄球菌耐藥突變選擇窗的影響
[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.
【作者單位】: 山東省濱州市人民醫(yī)院呼吸內(nèi)科;
【基金】:山東省醫(yī)藥衛(wèi)生發(fā)展計(jì)劃資助項(xiàng)目(2014WS0310)
【分類號(hào)】:R446.5
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