Correlation Between Integron and Drug-resistance in Clinical Isolates of Acinetobacter baumannii

OBJECTIVE To investigate the drug-resistant rates of clinical Acinetobacter baumannii strains isolated from our hospital and to understand the integrons distribution carried by A.baumannii.To identify the type of the integrons and analyze the correlation between integron and drug resistance in A.baumannii clinical isolates. METHODS Collected clinical isolates and the drug-sensitivity tests were completed by the method of KB.Amplified integrase were tested by PCR and identified the integron category.Correlation between integron in A.baumannii and drug resistance was analyzed.The open reading frame(ORF) of integron were amplified and observed the polymorphism of integron,Part of amplified products were sequenced. RESULTS Apart from imipenem and cefoperazone /sulbactam,the drug-resistant rate of 85 A.baumannii clinical isolates to else 15 kinds of antibacterials surpassed 30.0%.67.1% A.baumannii clinical isolates carried the integrons,and confirmed all of them belonged to integron Ⅰ after identification,but integrons Ⅱ and Ⅲ were not found.The drug-resistant rates of A.baumannii with integron to 14 kinds of antibacterials were higher than those of A.baumannii without integron.The length of amplified products in variable region of ORF of integron varied from 0.15 to 2.5 kb.The sequencing results confirmed the integron carried multidrug-resistant gene code. CONCLUSIONS Drug-resistant rate of A.baumannii clinical isolates in our hospital is higher and the majority of them are multidrug-resistant strains.The drug-resistant rates of A.baumannii with integron to 14 kinds of antibacterial are higher.The multidrug-resistant A.baumannii is associated with integrons.