摘要
目的 了解产科病房新生儿肠道中耐药肠杆菌目细菌携带状况及菌株特征。方法 收集2017年9月至2018年5月间云南省某医院产科病房新生儿粪便样本277份,通过超广谱β-内酰胺酶(ESBL)显色培养基分离培养、菌株药物敏感检测及代表菌株Illumina基因组测序,分析新生儿肠道耐药菌携带状况,菌株耐药表型、耐药基因型及序列分型(STs)特征。结果 277份样品中113份样品ESBL显色培养基培养阳性,阳性率40.79%。分离鉴定出4个属11个种的113株肠杆菌目细菌,其中,克雷伯属53.10%(60/113),埃希菌属30.10%(34/113),肠杆菌属15.04%(17/113)及勒克氏菌属1.77%(2/113)。菌株呈现多重耐药性,除对二代、三代头孢菌素高度耐药外,对其他种类代表抗菌药物耐药率分别为厄他培南52.21%(59/113)、甲氧苄啶/磺胺甲恶唑72.57%(82/113)、四环素65.49%(74/113)和环丙沙星54.87%(62/113)。挑选84株代表菌株完成基因组序列分析,共筛查到70种耐药基因,携带率较高的有sul1(84.52%,71/84)、fos A(71.43%,60/84)、tet(A)(67.86%,57/84)、bla_(SHV)(63.10%,53/84)和bla_(NDM)(61.90%,52/84)基因。53株肺炎克雷伯菌呈现优势克隆型集中分布,ST17型占比达92.45%(49/53),且均携带bla_(NDM-1)基因,其他种属菌株ST型别呈多样性。检出携带bla_(NDM-1)的阴沟肠杆菌、霍氏肠杆菌,携带bla_(IMP-26)的格氏克雷伯菌,携带bla_(IMP-1)的勒克氏菌和携带mcr的阿氏肠杆菌、霍氏肠杆菌及赫氏埃希菌。结论 本研究发现了某产科病房新生儿肠道高比例携带ESBL耐药肠杆菌,揭示了耐药菌株极易在新生儿间传播和肠道定植,应高度重视新生儿耐药菌环境暴露风险及对其肠道微生态建立的影响。
Objective To investigate the colonization status and strain characteristics of resistant Enterobacterales in the intestine of neonates.Methods 277 fecal samples of neonates in the maternity ward of a hospital were collected from September 2017 to May 2018 in Yunnan province.We analyzed the status of carriage of drug-resistant bacteria in the intestinal tract of neonates,strain resistance phenotypes,resistance genotypes and sequence types(STs)characteristics by isolation and culture in extended spectrumβ-lactamase(ESBL)chromogenic medium,strain drug susceptibility testing and genome sequencing of Illumina,a representative strain.Results 113 fecal samples out of 77 samples were ESBL-positive strains,with a positivity rate of 40.79%.113 Enterobacterales strains of 11 species from 4 genera were isolated and identified,including Klebsiella 53.10%(60/113),Escherichia 30.10%(34/113),Enterobacter 15.04%(17/113),and Leuconostoc 1.77%(2/113).The strains presenting multidrug-resistant profiles.Except for highly resistant to second and third-generation cephalosporin,the resistance rates of carbapenems,sulfonamides,tetracyclines and ciprofloxacin were 52.21%(59/113),72.57%(82/113),65.49%(74/113),and 54.87%(62/113),respectively.The genome sequences of 84 representaive strains were screened,and al of 70 drug r(esis)tance genes were detected,including sul1(84.52%,71/84),fosA(71.43%,60/84),tet(A)(67.86%,57/84),bla_(SHV)(63.10%,53/84)and bla_(NDM)(61.90%,52/84).53 Klebsiella pneumoniae showed a concentrated distribution of clones,ST17 carrying bla_(NDM-1) gene accounted for 92.45%(49/53).The STs of other species were diverse.Enterobacter cloacae and Enterobacter hormaechei carrying bla_(NDM-1),Klebsiella gordonii carrying bla_(IMP-26),Leclercia carrying bla_(IMP-1),and Enterobacter albus,E.hormaechei and Escherichia hermannii carrying mcr were detected.Conclusion It is found that a high proportion of neonates in a maternity ward carried ESBL-resistant enterobacters in their intestines,revealing that drug-resistant strains are hig
作者
姜雪琪
贾森泉
白雪梅
孙静
刘泽梁
龚心怡
苗贝贝
李杰
孟双
尹建雯
李娟
Jiang Xueqi;Jia Senquan;Bai Xuemei;Sun Jing;Liu Zeliang;Gong Xinyi;Miao Beibei;Li Jie;Meng Shuang;Yin Jianwen;Li Juan(National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Disease,Institute for Infectious Disease Control and Prevention,Chinese Center for Disease Control and Prevention,Beijing 102206,China;Yunnan Provincial Center for Disease Control and Prevention,Kunming 650022,Yunnan,China)
出处
《疾病监测》
CAS
CSCD
北大核心
2024年第3期336-342,共7页
Disease Surveillance
基金
国家自然科学基金(No.81861138053)。
关键词
新生儿
肠道菌群
超广谱Β-内酰胺酶
多重耐药菌
耐药基因
Neonate
Intestinal flora
Extended spectrumβ-lactamase
Multidrug-resistant bacteria
Resistance gene
