4种配比的头孢曲松/他唑巴坦的体外抗菌活性

Antibacterial activities of different matching ratios of Ceftriaxone and Tazobactam in vitro

目的研究4种配比头孢曲松/他唑巴坦(CRO/TAZ)及头孢曲松(CRO)单剂对四川地区临床分离致病菌的体外抗菌活性。方法测定525株临床分离致病菌的最低仰菌浓度(MIC)最低杀菌浓度(MBC);采用活菌计数法绘制杀菌曲线;并观察细菌接种量、培养基pH和血清蛋白含量对体外抗菌活性的影响。结果4种配比CRO/TAZ对甲氧西材耐药金菊菌和表皮葡萄球功的MIC50为1~8 mg.L-1,是CRO单剂的1/32~1/256;对产ESBLs大肠埃希菌和肺炎克雷伯菌的MIC50分别降低了8~32倍和16~64倍,MIC90降低了8倍以上;CRO/TAZ(6:1)体外抗菌作用优于头孢哌酮钠-他唑巴坦钠(4:1)或相当;但优于哌拉西林钠-他唑巴坦钠(8:1);4种配比CRO/TAZ均具有很强的杀菌作用,明显优于CRO单剂。结论4种配比CRO/CAZ对大多数临床分离的致病菌均有较强的体外抗菌活性,明显高于单剂。其中,6:1为较合理的配方。

OBJECTIVE To study the antibacterial activities of ceftriaxone and Ceftriaxone/Tazobactam(CRO/TAZ) against clinically isolated pathogenic bacteria from Sichuan area in vitro.METHODSMinimal inhibitory concentrations(MIC) and minimal bactericidal concentrations(MBC) were determined on 525 clinically isolated pathogenic bacteria.Killing curve was drawn by determination of colony forming unit counts at each time interval.The influences of the inoculum size,pH and concentration of serum protein on antibacterial ...