2018年湖州市8起腹泻聚集疫情中诺如病毒的感染与流行

Prevalence of norovirus infection in 8 outbreaks of infectious diarrhea in Huzhou city, 2018

目的对湖州市2018年8起诺如病毒(norovirus,NoV)感染性腹泻聚集疫情基因特征进行分析。方法采用荧光定量RT-PCR方法对采集的73份病例标本进行NoV核酸检测,并从每起聚集性疫情中选取NoV核酸阳性标本进行多聚酶和衣壳蛋白区域扩增,扩增产物进行核酸序列测定和基因特征分析。结果8起疫情中共57份标本为GII型NoV核酸阳性,5份标本为GI型和GII型NoV核酸双阳性。NoV多聚酶和衣壳蛋白核酸序列比对结果显示,5起暴发是GII.P16/GII.2型,1起GII.P17/GII.17型,1起是GII.P12/GII.3型,1起是GI.P4/GI.5型和GII.P17/GII.17型混合感染。结论NoV是引起湖州市感染性腹泻聚集疫情的主要病原体,以GII型为主,有多种基因型别,并存在着重组株。

Objective To analyze the genetic characteristics of norovirus(NoV)outbreaks in Huzhou city in 2018.Methods Totally 73 stool samples were collected from NoV outbreaks and tested by real-time RT-PCR.The polymerase and capsid protein regions were amplified from the norovirus nucleic acid positive samples in each cluster epidemic.The amplified products were further analyzed by gene sequencing and genotyping.Results A total of 57 specimens from 8 outbreaks were positive for GII type NoV nucleic acid and 5 samples were positive for both genogroupⅠand genogroupⅡ.The alignment of polymerase and capsid protein nucleic acid sequences showed that 5 cases were GII.P16/GII.2 type,1 case was GII.P17/GII.17 type,1 case was GII.P12/GII.3 type,and 1 case was mixed infection with GI.P4/GI.5 type and GII.P17/GII.17 type.Conclusions NoV is the main pathogen causing the epidemic of acute gastroenteritis and diarrhea in Huzhou city.The virus was mainly GII type,with multiple genotypes and recombinant strains.