哌拉西林-舒巴坦等七种药物对非发酵菌体外抗菌活性的研究

In vitro antimicrobial activity of piperacillin-sulbactam and other 7 antimicrobial agents against non- fermentative bacilli

目的 评价哌拉西林-舒巴坦等7种药物对非发酵菌的体外抗菌活性.方法 采用微量肉汤稀释法测定哌拉西林-舒巴坦对细菌的体外抗菌作用.结果 广州地区6家医院共收集菌株770株,其中铜绿假单胞菌216株,鲍曼不动杆菌242株,嗜麦芽窄食单胞菌100株,洋葱伯克霍尔德菌119株,黄杆菌属57株,产碱杆菌属36株.对所有铜绿假单胞菌,哌拉西林-舒巴坦的敏感性最高（71.9%）,而亚胺培南、头孢吡肟、头孢他啶、头孢哌酮-舒巴坦敏感性均低于50%.对亚胺培南不敏感的铜绿假单胞菌,哌拉西林-舒巴坦敏感性仍可达55.8%.对碳青霉烯敏感的鲍曼不动杆菌,哌拉西林-舒巴坦和头孢哌酮-舒巴坦敏感性最高,分别为71.0%和73.0%.对嗜麦芽窄食单胞菌,26%和20%的菌株对哌拉西林-舒巴坦和哌拉西林-他唑巴坦的最低抑菌浓度（MIC）≤16 mg/L.对洋葱伯克霍尔德菌,69%的菌株对哌拉西林-舒巴坦的MIC≤16 mg/L.对黄杆菌属和产碱杆菌属,哌拉西林-舒巴坦、头孢哌酮-舒巴坦和哌拉西林他唑巴坦3种加酶复合制剂敏感性最高,分别为70.2%、63.2%、57.9%和94.4%、94.4%、91. 7%.结论 哌拉西林-舒巴坦对多种非发酵菌尤其是碳青霉烯不敏感的铜绿假单胞菌具有良好的体外抗菌活性.

Objective To evaluate the in vitro antimicrobial activity of piperacillin-sulbactam against clinical isolates of non-fermentative bacilli isolated from common infections. Methods Microdilution was employed to study the antimicrobial resistance. Results A total of 770 strains were collected from 6 hospitals in Guangzhou, including Pseudomonas aeruginosa, Acinetobacter baumannii, Stenotrophomonas maltophilia , Burkholderia cepacia , Flavobacterium , and Alcaligenes. Compared with other β-lactams,piperacillin-sulbactam displayed the highest activity against all the isolates of P. aeruginosa, especially for imipenem non-sensitive isolates, with the susceptibility of 71.9% and 55.8%, respectively. Piperacillinsulbactam and cefoperazone-sulbactam kept good activity against imipenem sensitive isolates of A. baumannii,with the susceptibility of 71.0% and 73. 0%, respectively. For the strains of Burkholderia cepacia, 69% strains exhibited minimal inhibitory concentration （MIC） of ≤ 16 mg/L for piperacillin-sulbactam. For the strains of Flavobacterium, and Alcaligenes, piperacillin-sulbactam also had excellent activity, with the susceptibility of 70. 2% and 94. 4%, respectively. Conclusion Piperacillin-sulbactam exhibits good activity again non-fermentative bacilli, especial for imipenem non-sensitive isolates of P. aeruginosa.