Objective To identify strains of Acinetobacter(A.)calcoaceticus-A.baumannii complex accurately,and investigate the species distribution of Acinetobacter calcoaceticus-A.baurnannii(ACB)complex isolated in Daping Hospital.Analysis the anti-biotics resistance of ACB complex.Methods A total of 95 clinica1 isolates of ACB complex were collected from Daping Hospital from February to April 2014,identify by sequence analysis of 1 6S rRNA gene spacer region.Use VITEK-2compact automatic iden-tification of bacteria by susceptibility meter to detect the precise identification of all ACB complex group of drug sensitivity.Results Among all the 95 strains of ACB complex identification results were A.baumanni (81,85.26%),A.pittii(10,10.53%),A.noso-comialis (4,4.21%).A.baumannii to third generation cephalosporins,aminoglycosides and carbapenem antibiotic resistance in seri-ous condition,the sensitive rate was only about 20.00%.But A.pittii and A.nosocomialis had a high sensitivity rate to commonly used antibiotics.Conclusion VITEK-2 Compact automatic identification of bacteria susceptibility meter has limitations in identifica-tion of Acinetobacter,with analysis of 1 6S rRNA gene sequencing,the ACB complex could be accurately identified.There is signifi-cant difference in the composite group-resistant characteristics of each species,clinical infection is also various.%目的：精确鉴定醋酸钙-鲍曼不动杆菌复合菌菌种，了解第三军医大学大坪医院醋酸钙-鲍曼不动杆菌复合菌的菌种分布情况；比较分析各菌种对临床常用抗菌药物的体外敏感率。方法选取2014年2~4月该院临床分离的95株醋酸钙-鲍曼不动杆菌复合菌非重复菌株，采用16S rRNA 基因测序法鉴定所有菌株到种；利用 VITEK-2 Compact 自动细菌鉴定药敏仪检测所有细菌对临床常用抗菌药物的体外敏感率。结果95株醋酸钙-鲍曼不动杆菌复合菌精确鉴定为鲍曼不动杆菌81株(85.26%)、皮特不动杆菌10株(10.53%)、医院不动杆菌4株(4.21%)。药敏试验结果显示，鲍曼不动杆菌对三代头孢菌素、氨基糖苷类和碳青霉烯类抗菌药物耐药情况严重，敏感率在20.00%左右。而皮特不动杆菌和医院不动杆菌对常用抗菌药物的敏感率都较高。结论传统的生化鉴定方法在不动杆菌种属鉴定中存在局限性，利用16S rRNA 基因测序分析，就可以精确鉴定醋酸钙-鲍曼不动杆菌复合菌，复合菌中各菌种的耐药特性存在较大差异。
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