广东省2014年食源性副溶血弧菌病原学特征分析

李柏生; 谭海玲; 柯碧霞; 何冬梅; 柯昌文; 张永慧

Abstract

李柏生,谭海玲,柯碧霞,何冬梅,柯昌文,张永慧.广东省2014年食源性副溶血弧菌病原学特征分析[J].Chinese journal of Epidemiology,2015,36(11):1283-1287

广东省2014年食源性副溶血弧菌病原学特征分析

Etiologic characteristics of food-borne Vibrio parahaemolyticus strains isolated in Guangdong, 2014

Received:March 17, 2015

DOI：10.3760/cma.j.issn.0254-6450.2015.11.020

KeyWord: 副溶血弧菌病原学特征脉冲场凝胶电泳多位点序列分型

English Key Word: Vibrio parahaemolyticus Etiologic characteristic Pulsed field gel electrophoresis Multi locus sequence typing

FundProject:广东省医学科学研究基金(A2014090); 广东省科技计划项目(2014A020219004)

Author Name	Affiliation	E-mail
Li Baisheng	Institute of Pathogenic Microbiology Bacteriology Laboratory, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
Tan Hailing	Institute of Pathogenic Microbiology Bacteriology Laboratory, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
Ke Bixia	Institute of Pathogenic Microbiology Bacteriology Laboratory, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
He Dongmei	Institute of Pathogenic Microbiology Bacteriology Laboratory, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
Ke Changwen	Institute of Pathogenic Microbiology Bacteriology Laboratory, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China
Zhang Yonghui	Institute of Pathogenic Microbiology Bacteriology Laboratory, Guangdong Provincial Center for Disease Control and Prevention, Guangzhou 511430, China	zyh@cdcp.org.cn

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Abstract:

目的了解2014年广东省食源性副溶血弧菌分离株的血清型别、抗生素敏感性、毒力基因携带情况以及分子分型特征。方法对60株副溶血弧菌分离株进行血清分型、抗生素敏感性试验及检测耐热直接溶血素基因(tdh)和耐热相关溶血素基因(trh),并进行脉冲场凝胶电泳(PFGE)和多位点序列(MLST)分型。结果 60株分离株可分为13个血清型,主要型别为O3:K6、O4:K8、O1:K36和O4:KUT;对氨苄西林、磺胺复合物和头孢噻吩的耐药率分别为100.0%、43.3%和28.3%,有56.7%(34/60)的菌株对2类及以上抗生素同时耐药,2株菌对3类抗生素同时耐受。毒力基因PCR检测发现,有63.3%(38/60)的分离株为tdh⁺trh^-菌株,仅1株为tdh⁺trh+菌株。分子分型显示,经NotⅠ酶消化后,60株副溶血弧菌可产生48个PFGE谱型,可分为3个聚类(Cluster A、B和C)。其中Cluster B的菌株主要分离自食源性疾病监测中心散发病例,血清型以O3:K6为主,PFGE谱型的相似度在62.6%～100.0%;Cluster C主要是由4株O4:K8型菌株组成,谱型相似度为56.7%～62.5%。60株菌MLST分型可分为26个ST型,其中33株菌为ST-3型,主要是O3:K6和O1:K36菌株;4株O4:K8菌株聚集成另一个不同于ST-3型的相对优势的菌群。结论 2014年广东省副溶血弧菌菌型多样性可能是疾病高发的原因之一,O4:K8型菌株的分子特征与其他优势血清型别明显不同,应高度警惕该型菌株引起暴发的可能。

English Abstract:

Objective To investigate the serotypes, antimicrobial resistance, virulence genes and molecular characteristics of food-borne Vibrio parahaemolyticus isolated in Guangdong province in 2014. Methods Sixty V. parahaemolyticus strains were tested in this study. The serotyping and antibiotic resistance test were conducted, while the tdh and trh gens of the strains were detected with conventional PCR, and pulsed field gel electrophoresis (PFGE) and multiple locus sequence typing (MLST) were conducted too. Results The 60 strains belonged to 13 serotypes, the major serotypes included O3:K6, O4:K8, O1:K36 and O4:KUT. The antibiotic resistance test indicated the isolates were highly resistant to ampicillin (100.0%), sulfonamides (43.3%) and cefalotin (28.3%). Up to 56.7%(34/60) of the strains were resistant to two or more antibiotics, and 2 strains showed resistance to three antibiotics. The virulence gene detection indicated that 63.3% (38/60) of the strains carried tdh⁺trh^-, while only 1 strain carried tdh⁺trh⁺. The 60 strains digested by NotⅠbelonged to 48 different PFGE patterns and 3 clusters. The cluster B included the strains isolated from sporadic food borne cases with serotype of O3:K6 and similarity of 62.6%-100.0%. The cluster C included O4:K8 strains with the PFGE pattern similarity of 56.7%-62.5%. The MLST indicated that the 60 strains had 26 sequence types (STs). The ST-3 was predominant, including 33 strains (serotypes O3:K6 and O1:K36). The four O4:K8 strains formed another predominant colony, which was different from ST-3. Conclusion The etiologic characteristics of V. parahaemolyticus varied, which might be one of the reasons for high incidence of food-borne V. parahaemolyticus infection in Guangdong. The molecular characteristics of O4:K8 strain were different from the other predominant serotypes. Close attention should be paid to the possible outbreak caused by O4:K8 strain in this area.

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