检验医学 ›› 2021, Vol. 36 ›› Issue (7): 743-748.DOI: 10.3969/j.issn.1673-8640.2021.07.014

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agr功能缺陷金黄色葡萄球菌流行及遗传学特征

鲍桃香, 宋皓月, 杨涵, 何春燕, 舒文, 陈雯静, 汤荣, 刘庆中()   

  1. 上海交通大学附属第一人民医院,上海 201620
  • 收稿日期:2020-06-22 出版日期:2021-07-30 发布日期:2021-07-26
  • 通讯作者: 刘庆中
  • 作者简介:刘庆中,E-mail: jiaodamedicine@foxmail.com
    鲍桃香,女,1989年生,学士,主管技师,主要从事临床微生物检验和金黄色葡萄球菌耐药性研究。
    宋皓月,女,1994年生,硕士,住院医师,主要从事临床微生物检验工作。第一联系人:

    鲍桃香和宋皓月对本研究具有同等贡献,并列为第一作者。

  • 基金资助:
    国家自然科学基金项目(81772247);国家自然科学基金项目(81371872);上海市松江区科技攻关(医疗卫生类)项目(2020SJ303)

Prevalence and genetic characteristic of Staphylococcus aureus with agr dysfunction

BAO Taoxiang, SONG Haoyue, YANG Han, HE Chunyan, SHU Wen, CHEN Wenjing, TANG Rong, LIU Qingzhong()   

  1. Shanghai General Hospital,Shanghai Jiao Tong University,Shanghai 201620,China
  • Received:2020-06-22 Online:2021-07-30 Published:2021-07-26
  • Contact: LIU Qingzhong

摘要:

目的 研究金黄色葡萄球菌附属基因调节子(agr)功能缺陷金黄色葡萄球菌的流行及遗传学特征。方法 收集上海市和浙江省5家医院临床分离的1 238株金黄色葡萄球菌,采用头孢西丁纸片法确定其对甲氧西林的耐药性;采用δ溶血活性检测筛选agr功能缺陷菌株,应用agr分型、葡萄球菌盒式染色体mec(SCCmec)分型、金黄色葡萄球菌蛋白A基因(spa)分型和多位点序列分型(MLST)确定相关菌株的分子特征。结果 agr功能缺陷金黄色葡萄球菌总流行率为3.6%(45/1238),其中耐甲氧西林金黄色葡萄球菌(MRSA)的检出率[5.0%(28/565)]显著高于甲氧西林敏感金黄色葡萄球菌(MSSA)[2.5%(17/673)](P=0.023)。基因分型结果显示,agr功能缺陷MRSA以ST5(CC5)-SCCmecⅡ-t002/t311/t2460-agr2和ST239(CC8)-SCCmecⅢ-t037-agr1为主,而MSSA主要为ST188(CC1)-t189-agr1。结论 沪浙地区agr功能缺陷金黄色葡萄球菌并不常见,其流行可能与特定型别克隆株的传播有关。

关键词: 金黄色葡萄球菌, 附属基因调节子, 流行, 分子特征

Abstract:

Objective To investigate the prevalence and genetic characteristic of Staphylococcus aureus with accessory gene regulator(agr) dysfunction. Methods A total of 1 238 isolates of Staphylococcus aureus were collected from 5 hospitals in Shanghai and Zhejiang. All the isolates were determined for methicillin resistance by cefoxitin disc,and were screened for agr dysfunction by determining δ-hemolysin production deficiency. The molecular characteristics of isolates with agr dysfunction were analyzed by agr typing,staphylococcal cassette chromosome mec(SCCmec) typing,staphylococcal protein A(spa) typing and multilocus sequence typing(MLST). Results The 3.6%(45/1 238) of isolates were agr defective,which was more prevalent among methicillin-resistant Staphylococcus aureus(MRSA)[5.0%(28/565)] and methicillin-sensitiveStaphylococcus aureus(MSSA)[2.5%(17/673)](P=0.023). The analysis of genotyping displayed that ST5(CC5)-SCCmecⅡ-t002/t311/t2460-agr2 and ST239(CC8)-SCCmecⅢ-t037-agr1 were the predominant clones among agr defective MRSA isolates,and ST188(CC1)-t189-agr1 was the most abundant clone among agr defective MSSA isolates.Conclusions The rate of Staphylococcus aureus with agr dysfunction is low in Shanghai and Zhejiang,and its prevalence might be related to the spread of specific clones.

Key words: Staphylococcus aureus, Accessory gene regulator, Prevalence, Genetic characteristic

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