GII.P7/GII.14型诺如病毒暴发的分子特征分析

目的 了解江苏地区3起诺如病毒(Norovirus,NoV)暴发疫情中病毒感染情况,并对其分子流行病学特征进行初步研究.方法 收集暴发疫情中患者的肛拭子标本53份,采用实时荧光RT-PCR定性检测NoV,阳性标本利用普通RT-PCR对其聚合酶区(RNA-dependent RNA polymerase,RdRp)及衣壳蛋白区(VP1)片段进行扩增和测序分析.结果 3起NoV暴发疫情中,阳性检出率为56.6%(30/53).对30株阳性标本序列进行分析,其RdRp区与GII.P7的同源性最高(93.86%),VP1区与GII.14的同源性较高(97.13%).初步判断为GII.P7/GII.14重组毒株,SimPlot分析可能的重组位点在核苷酸5009位.对其氨基酸序列进行分析发现在RdRp区和VP1区均出现部分氨基酸突变.结论 3起NoV暴发疫情均由同一重组毒株引起,提示GII.P7/GII.14重组株传染性较强,有可能再次引起暴发,应加强监测防控.     

The emergence of recombinant norovirus GII.12[P16] and predominance of GII.3[P12] strains in pediatric patients with acute gastroenteritis in Thailand, 2019–2020

Norovirus (NoV) and sapovirus (SaV) are important pathogens that cause acute gastroenteritis (AGE) in all age groups, commonly in children worldwide. Recently, a number of studies have reported a wide variety of NoV recombinant strains. This study aimed to investigate the distribution of NoV and SaV recombinant strains circulating in Chiang Mai, Thailand, during 2019–2020. One hundred and twenty-four NoV and seven SaV strains detected in children admitted to the hospital with AGE were included in this study. The partial RNA-dependent RNA-polymerase (RdRp)/VP1 regions of these NoV and SaV strains were analyzed by phylogenetic analysis, Simplot, and RDP software. Overall, eight recombination patterns of NoV were detected. NoV GII.4[P16] was the most common strain detected (39.1%), followed by GII.3[P12] (25.0%), GII.4[P31] (17.2%), and other recombinant strains were detected at a lower rate. NoV GII.12[P16] strains were detected for the first time in Thailand. For SaV, none of the recombinant strains was detected. All SaV strains, GI.1/GI.1, GI.2/GI.2, and GII.5/GII.5, exhibited VP1 genotype corresponded to RdRp genotype. In conclusion, this study demonstrates the distribution and diversity of NoV and SaV recombinant strains circulating in pediatric patients with AGE in Chiang Mai, during 2019–2020 with the emergence of NoV GII.3[P12] and GII.12[P16].     

我国重组型GII.2[P16]诺如病毒进化动力学和传播模式

目的:2016年冬季出现了一种重组型GII.2[P16]诺如病毒（norovirus,NoV）,并造成了我国急性胃肠炎大规模暴发,本研究旨在探究2016—2017年该病毒在我国的进化动力学和时空传播模式。方法:利用MEGA 7.0和BEAST等软件对先前获得的暴发标本中GII.2[P16] NoV全基因组、主要结构蛋白...     

Molecular changes in the norovirus polymerase gene and their association with incidence of GII.4 norovirus-associated gastroenteritis outbreaks in Victoria,Australia, 2001–2005

This study examined whether a specific (six-nucleotide) sequence in the norovirus polymerase (POL) gene could act as a marker of GII.4 epidemics in Australia in 2001–2005. The predominant variant (pv) in an epidemic year (2002, 2004) changed relative to the pv in the previous year (AACTTG in 2001 to AATCTG in 2002, AATCTG in 2003 to AACTTG in 2004). The pv in a non-epidemic year (2003, 2005) was the same as in the preceding year (AATCTG in 2002 and 2003, AACTTG in 2004 and 2005). Thus, specific short nucleotide sequences could act as markers of major GII.4 norovirus epidemics.     

新型联检GI和GII型诺如病毒荧光微球检测条的研制和应用

制备并评估联检GI和GII型诺如病毒荧光微球检测条的检测效率。以层析材料和特异性双抗体,按常规双抗体夹心法制备联检GI和GII型诺如病毒荧光微球检测条。以轮状病毒细胞培养物和343例临床表现为胃肠道感染症状病人的粪便标本作为检测对象,用联检GI和GII型诺如病毒荧光微球检测条检测并与CerTest Norovirus GI-GII one step combo card test检测结果比较。成功制备了联检GI和GII型诺如病毒荧光微球检测条。检测性能:1联检GI和GII型诺如病毒荧光微球检测条的敏感性较CerTest Norovirus GI-GII one step combo card test方法高(4~8)倍;2与轮状病毒(Wa株)等一些肠道病毒无交叉反应。结果表明成功制备联检GI和GII型诺如病毒荧光微球检测条,其检测性能良好。     

Professor Dr. phil. Dr. h. c. Eduard Reichenow zum Gedächtnis

Ohne Zusammenfassung     

减肥.孤僻.偷窃

去年10月，河北某师范学校92级女生张某，因累犯偷窃错误而受到留校察看处分，引起了老师、同学们的纷纷议论。有的认为，该生品质很坏，应该开除学籍。笔者认真分析研究了张某的有关资料，结论是，该生所犯错误不能说明她品质很坏，这是病态心理引起的不良行为反应。张某现年19岁，聪明伶俐。争强好胜，容貌依好，只是身体胖了点。她看到同龄少女身材苗条，由衷羡慕，于是下决心通过节食来减肥。早晨吃～两粥，中午吃一个馒头，晚饭有时不吃，整日处于饥饿状态，实在奈不住，就饥不择食，从洗碗间里抢点同学扔下的馒头充饥。不久，身体果然…     

GII.4型人诺如病毒VP2蛋白的原核表达与多克隆抗体制备

目的原核表达GII.4基因型人诺如病毒(human norovirus, HuNoV)次要衣壳蛋白VP2并制备多克隆抗体。方法设计特异性引物扩增GII.4 HuNoV的VP2全基因, 酶切连接至原核表达载体pGEX-6P-1, 将鉴定正确的重组质粒转化BL21(DE3)感受态细胞。挑取单克隆摇菌, 加入IPTG诱导重组GST-VP2融合蛋白的表达, 经GST亲和层析纯化和酶切, 获得GII.4 HuNoV VP2蛋白。通过SDS-PAGE分析纯化后HuNoV VP2蛋白相对分子质量。将纯化的GII.4 HuNoV VP2蛋白(0.5 mg/ml)免疫BALB/c小鼠, 制备多克隆抗体。结果 GII.4 HuNoV VP2蛋白被成功表达和纯化, 相对分子质量(Mr.×103)约29。将GII.4 HuNoV VP2蛋白免疫BALB/c小鼠制备的多克隆抗体滴度高达1∶1 280 000。Western blot与间接ELISA分析显示该多克隆抗体能和GII.4 HuNoV VP2抗原特异性结合。结论利用原核表达系统成功表达了GII.4 HuNoV VP2蛋白, 并成功制备出高效价GII.4...     

In memory of Prof. Dr. K. T. Friedhoff (* 05.06.1932 – † 02.09. 2018)

Parasitology Research -