摘要
目的探讨临床分离泛耐药鲍曼不动杆菌(PDR-ABA)β-内酰胺酶编码基因的存在状况。方法使用PCR法对20株PDR-ABA菌进行14种A类、10种B类β-内酰胺酶编码基因(金属β-内酰胺酶)、2种C类和8种D类β-内酰胺酶编码基因(合计34种β-内酰胺酶基因)的基因检测,并使用PCR法对插入序列ISAba1与β-内酰胺酶bla OXA-23基因(ISAba1-OXA-23)、插入序列ISAba1与β-内酰胺酶ADC-57基因(ISAba1-ADC-57)的进行连锁检测。对PCR阳性产物使用全自动荧光法进行测序。结果 20株PDR-ABA均检出bla TEM-1、bla ADC-57、bla DHA-1和bla OXA-23的4种β-内酰胺酶基因,且ISAba1-OXA-23和ISAba1-ADC-57的连锁检测均为阳性。结论本组菌株耐全部β-内酰胺类药物原因可能与其产TEM-1、ADC-57、DHA-1和OXA-23等四种β-内酰胺酶相关,且ADC-57和OXA-23这2种β-内酰胺酶基因的高表达对耐药贡献率更高。
Abstract Objective To investigate the distribution and variety of β-1actamase genes in a group of clinical isolated pandrug resistant of Acinetobacter baumannii (PDR-ABA). Methods 14 kinds of class A ^-lactamase, 10 kinds of class B β-1actamase (AmpC β-1actamase), 2 kinds of class C β-1actamase and 8 class kinds of D β-1actamase genes were tested by PCR.We also linkage analyzed the insertion sequence(IS) ISAbal with blaoxg.23 gene (ISAba1- OXA-23) and the IS ISAbal with b[aADC.57 gene (ISAba1-ADC-57) by PCR in the 20 strains. Then, we used fully automated fluorescence method for sequencing of PCR positive products. Results In 20 strains of PDR-ABA, we also detected β-1actamase genes of the blaTEM.1, blaAoc.57, blaoHA.1 and blaoxA.23. The linkage analysis of ISAbal- OXA-23 and 1SAba1-ADC-57 was positive. Conclusion All the 20 strains of Acinetobacter baumannii with the β-1actamases genes of blaTEM.1, blaADC.57, blaDHA.1 and blaoxA.23 maybe lead to resistant to all the β-1actams, and β- lactamase genes of blaADC.57 and blaoxA_23 highly expressed has higher contribution to the rate of resistance.
出处
《中国抗生素杂志》
CAS
CSCD
北大核心
2013年第11期I0004-I0008,共5页
Chinese Journal of Antibiotics