Clinical and epidemiological characteristics of multidrug-resistant Acinetobacter baumannii strains / 西安交通大学学报(医学版)

ABSTRACT

Objective To confirm the species of multidrug-resistant Acinetobacter baumannii (MRAB)strains collected from our hospital by specific PCR amplification,and further investigate their distribution,antibiotic resistance and molecular classification characteristics.Methods We collected 47 MRAB clinical strains which had been identified by VITEK-2 system,followed by species confirmation using specific primers sp2F,sp4F and sp4R through PCR amplification.Antibiotic resistance characteristics were detected using VITEK-2 system.And the homology of MRAB isolates was analyzed using multilocus sequence typing (MLST).Results We confirmed 46 out of 47 strains as A .baumannii .All of them were multidrug-resistant strains,and the majority of them were found in sputum samples from patients in intensive care units (ICUs).MLST analysis found 4 ST types,namely ST195,ST218,ST368 and ST208.The last two types had the closest genetic relationship.Conclusion SpecificPCR amplification is a rapid and accurate method to identify A .baumannii .The MRAB strains in our hospital are mainly distributed in ICUs and are susceptible to only a few antibiotics such as tigecycline.