南京市羊种布鲁菌分子特征分析

Molecular characterization of the Brucella ovis isolated in Nanjing

目的分析从南京市分离的布鲁菌菌株分子特征,了解菌株基因分型和聚类,为布鲁菌病的防治提供依据。方法对南京大学医学院附属鼓楼医院2011-2016年分离的7株羊种布鲁菌(来自7例散发病例),运用多位点序列分型(MLST)和多位点可变数目串联重复序列分析(MLVA)两种方法进行分子分型,并与江苏省的参考株数据进行聚类分析。结果分离到的7株羊种布鲁菌均为序列型(ST)8型菌株,并被MLVA分为7个基因型,且聚类在"中地中海簇"中。1株菌(NJ-2011-1株)与江苏省其他地区分离的2株菌基因位点完全相同。结论ST8型羊种布鲁菌为南京地区的优势菌,MLVA聚类在"中地中海簇"内。病例均为散发,传播途径及危险因素较为复杂,应加强各部门合作,从源头上作好布鲁菌病的防治工作。

Objective To analyze the molecular characteristics of Brucella strains isolated from Nanjing,understand strains genotying and clustering,and to provide a basis for prevention and treatment of brucellosis.Methods Multilocus sequence typing(MLST)and multiple locus variable-number tandem repeat analysis(MLVA)were used to analyze and characterize Brucella ovis strains isolated from 7 cases of sporadic cases in Nanjing Drum Tower Hospital,the Affiliated Hospital of Nanjing University Medical School,from 2011-2016,and cluster analysis was did with reference strain data from Jiangsu Province.Results The results showed that 7 strains were defined as sequence type(ST)8 by MLST.They were typed into 7 subtypes and clustered in the "Middle Mediterranean Cluster" by MLVA.Strain NJ-2011-1 and two strains isolated from other cities in Jiangsu had the same MLVA genotype.Conclusions The results reveal ST8 is the predominant genotype in Nanjing.They have clustered in the "Middle Mediterranean Cluster" by MLVA.The 7 strains are sporadic.The transmission routes and risk factors are more complicated in the city.Various departments should strengthen the cooperation to control the source.