[ Objective] To study the antibacterial activity of fosfomycin combined with other 9 antimicrobial agents against 47 strains of Acinetobacter in vitro, in order to provide laboratory data for clinical combination application. [ Methods] The 47 strains of acinetobacter isolated from sputum samples were treated by 10 antimicrobial agents alone and by fosfomycin combined with other 9 antimicrobial agents. Through the minimal inhibitory concentration (MIC) and fractional inhibitory concentration (FIC) index, using a two -fold agar dilution method, we could evaluate the antibacterial activity of fosfomycin combined with other 9 antimicrobial agents in vitro. [ Results] All the 47 strains of acinetobacter were resistant to fosfomycin, levofloxacin, ciprofloxacin, cefuroxime, ceftazidime, cefepime, cefoperazone/sulbactam, amikacin, and were intermedium to meropenem and imipenem/cilastatin. The ratio of antimicrobial agents was 1: 1. The MICs of fosfomycin combined with other 9 antimicrobial agents were lower than those of 10 antimicrobial agents alone and FIC index≤2. The primary action was synergistic/additional effect. There was no antagonistic effect observed. [ Conclusion] Synergistic/additional effect was observed in fosfomycin combined with levofloxacin, ciprofioxacin, cefuroxime, ceftazidime, cefepime, cefoperazone/sulbactam, amikacin, meropenem and imipenem/cilastatin against acinetobacter in vitro. The antimicrobial activities of combination were increased.%[目的]研究磷霉素与其它9种临床常用抗菌药物分别联合应用对47株不动杆菌的体外抗菌活性.[方法]收集痰标本中分离出的不动杆菌47株,将磷霉素与其它9种抗菌药物在体外单独以及联合应用,采用琼脂二倍稀释法,测定最低抑菌浓度(MIC)、计算部分抑菌浓度(FIC)指数,评价磷霉素与其它9种抗菌药物分别联合应用的体外抗菌活性.[结果]磷霉素、左氧氟沙星、环丙沙星、头孢呋辛、头孢他啶、头孢吡肟、头孢哌酮/舒巴坦、阿米卡星单独应用时对47株不动杆菌的MIC50值均显示耐药,磷霉素分别与这9种抗菌药物在体外按1:1联合应用后,MIC值均比单独应用时有所下降,FIC指数均≤2,协同及相加作用的比例大于无关作用的比例,未见拮抗作用,磷霉素与阿米卡星联用后,使后者由耐药变成敏感.[结论]磷霉素与左氧氟沙星、环丙沙星、头孢呋辛、头孢他啶、头孢吡肟、头孢哌酮/舒巴坦、美罗培南、亚胺培南/西司他丁、阿米卡星在体外分别联合应用对不动杆菌有协同及相加作用,增强了这9种抗菌药物的抗菌活性.
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