耐碳青霉烯类铜绿假单胞菌耐药基因及毒力因子特征

Characteristics of drug resistance genes and virulence factors of carbapenem-resistant Pseudomonas aeruginosa

  • 摘要: 目的 分析耐碳青霉烯类铜绿假单胞菌(CRPA)的耐药基因及毒力因子特征。方法 收集2018年3月-2021年3月中国医科大学附属盛京医院普外科术后感染患者病灶分泌物分离的764株PA菌株进行菌株鉴定与药敏分析,提取菌株DNA,检测耐药基因和毒力因子。结果 764株PA菌株中检出CRPA菌株94株,检出率为12.30%;94株CRPA菌株对常用抗菌药物耐药性在55.32%~98.94%之间;94株CRPA菌株中检出了携带blaGESblaIMPblaVIM耐药基因的菌株,检出率分别为11.70%、10.64%、9.57%;94株CRPA菌株中检出了携带exoU、exoS、popB、LasI、Hcp2、LasR毒力因子的菌株,检出率分别为65.96%、46.81%、100.00%、86.17%、76.60%、89.36%。结论 CRPA对常用抗菌药物均高度耐药,但对阿米卡星、左氧氟沙星、庆大霉素、头孢他啶相对敏感,检出含有blaGESblaIMPblaVIM的耐药基因和携带exoU、exoS、popB、LasI、Hcp2、LasR的毒力因子。

     

    Abstract: OBJECTIVE To analyze the drug resistance genes and characteristics of virulence factors of carbapenem-resistant Pseudomonas aeruginosa (PA). METHODS A total of 764 stains of PA bacteria isolated from focal secretions of patients with post-surgical infection in Shengjing Hospital Affiliated to China Medical University between Mar. 2018 and Mar. 2021 were collected for strain identification and drug sensitivity analysis. DNA of bacterial strains were extracted, and drug resistance genes and virulence factors were detected. RESULTS Totally 94 strains of CRPA were detected in 764 strains of PA, with a detection rate of 12.30%. The resistance rates of 94 CRPA strains to commonly used antibacterial drugs ranged from 55.32% to 98.94%. Drug resistance genes, including blaGES, blaIMP and blaVIM were detected in 94 CRPA strains, with detection rates of 11.70%, 10.64% and 9.57%, respectively. Virulence factors, including exoU, exoS, popB, LasI, Hcp2 and LasR were detected in 94 CRPA strains, with detection rates of 65.96%, 46.81%, 100.00%, 86.17%, 76.60% and 89.36%, respectively. CONCLUSION The CRPA strains were highly resistant to all commonly used antibacterial drugs, but were relatively sensitive to amikacin, levofloxacin, gentamicin and ceftazidime. Drug resistance genes containing blaGES, blaIMP, and blaVIM, and virulence factors carrying exoU, exoS, popB, LasI, Hcp2 and LasR were detected.

     

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