NPJ Vaccines:中国学者研发出抗发热伴血小板减少综合征病毒的新疫苗

2019-02-25 疫苗 病毒学界

本工作以SFTSV AH12毒株的囊膜蛋白Gn/Gc为免疫原,通过将VSV病毒载体的囊膜蛋白G置换成SFTSV的囊膜蛋白Gn/Gc成功将免疫原展示到载体病毒的表面。

发热伴血小板减少综合征(SFTS),是2009年在中国新发现的一种虫媒病毒性出血热。截至目前,在我国多数省份都有发现,其中河南、湖北、江苏、安徽和山东等省份病例较多,并发生多起地方聚集性疫情。

该病一般以发热伴随呼吸道或消化道急症起病,初始症状与流感等病毒性感染疾病不易区分。随后出现血小板和白细胞进行性下降。其临床特征包括高热、血小板和白细胞减少、出血、肠道症状及多脏器功能衰竭,该病住院患者病致死率高达12-30%。发热伴血小板减少综合征病毒(Severe fever with thrombocytopenia syndrome bunyavirus, SFTSV)是SFTS综合征的病原体,属于布尼亚病毒目(Bunyavirales),白纤病毒科(Phenuiviridae)成员。

2012年美国密苏里州从两位病人体内分离到了一种跟SFTSV极为相近的病毒Heartland virus。日本和韩国也报道了SFTSV的感染病例。由此,SFTSV 已成为威胁多国公共卫生的重要新发病原体。

SFTSV主要通过蜱虫叮咬传播,长角血蜱是其主要媒介。病毒感染流行主要出现在春夏两季,多为散发。农林业工作者等与蜱虫接触较多的人群为第一易感人群,此外医护人员和与病人密切接触的家属等也是该病的易感人群。2018年美国多个州发现大量从亚洲入侵的长角血蜱,因此SFTSV也有向美洲扩散的风险。 SFTSV可能会通过宿主或媒介节肢动物体内同源重组而迅速变异,具有较大变异风险。世界卫生组织已经将SFTSV列为最需要关注的病毒之一。对SFTSV病毒疫苗的研发,是目前传染病领域亟待解决的问题。

水泡性口炎病毒(VSV)是弹状病毒科的一员,在诱发中和抗体方面显示出强大的功效,已被开发为非常有前景的减毒病毒疫苗载体。临床试验中,在疫苗接种者中只能检测到有限的VSV病毒血症,具有良好的安全性。复制型重组VSV(rVSV)载体已经用于多种烈性病毒的疫苗开发,并显示出良好的保护效果,如Ebola virus, Marburg virus, Lassa virus, Hendra virus, Nipah virus, 和Andes virus等。其中基于VSV载体开发的埃博拉病毒疫苗已经完成临床实验,于2018年在刚果民主共和国投入使用。

本工作以SFTSV AH12毒株的囊膜蛋白Gn/Gc为免疫原,通过将VSV病毒载体的囊膜蛋白G置换成SFTSV的囊膜蛋白Gn/Gc成功将免疫原展示到载体病毒的表面。单次免疫可在小鼠体内诱导产生高滴度的中和抗体,且中和不同支系的毒株,甚至Heartland virus。在干扰素α/β受体缺失的C57小鼠模中,单次免疫可以保护致死剂量的病毒攻击。SFTS病人主要是中老年人和免疫低下人群,而VSV-SFTSV对老年小鼠和免疫缺陷小鼠的也产生了100%的有效保护。

图1 VSV-SFTSV疫苗设计示意图

图2 VSV-SFTSV疫苗在小鼠模型中提供100%的保护

病毒载体疫苗面临的一个重要问题是病人体内预存的针对载体的免疫反应(pre-existing vector-specific immunity)会导致疫苗的效果大大降低。而在VSV-SFTSV的疫苗设计中,表面囊膜蛋白完全来自SFTSV,有效避免了针对VSV载体本身的免疫反应的影响。本工作首次SFTSV的囊膜蛋白可以诱导针对SFTSV的高滴度的中和抗体,并在小鼠模型中具有保护作用。这为后续的疫苗开发奠定了坚实基础。

原始出处:Fangfang Dong, Dandan Li, Dan Wen, et al. Single dose of a rVSV-based vaccine elicits complete protection against severe fever with thrombocytopenia syndrome virus. NPJ Vaccines. 25 January 2019

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    2019-06-21 gous
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    2019-12-16 kalseyzl
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    2019-02-26 lqvr
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小儿发热的合理用药,一文就搞定

发热是指体温超过正常范围高限,是小儿最常见的一种症状。正常小儿腋表体温为36℃-37℃,而肛表测得的体温比口表高约0.3℃,口表测得的体温比腋表高约0.4℃,如果腋表超过37.4℃可以认为是发热。发热主要包括体温上升期、高热持续期、体温下降期三个过程。

这种病早期症状酷似感冒,误诊极易出人命!

它就叫流行性出血热,又称肾综合征出血热,是由流行性出血热病毒(汉坦病毒)引起的,以鼠类为主要传染源的人兽共患自然疫源性疾病。一年四季均可发病,野鼠型以11月至次年1月为高峰,家鼠型流行高峰为3-5月。

探案:发热、痰血、关节肿痛——是谁在整蛊我?

主诉:发热伴痰中带血、左上肢肿痛1月

发热、皮疹伴快速进展型间质性肺炎,小心这类疾病!

患者2周前受凉后出现咳嗽,干咳为主,偶少量白稀痰,伴发热(体温不详),曾于外院就诊,诊断“社区获得性肺炎”,予以抗感染治疗,症状无改善。1周前出现活动后气促,并呈进行性加重。遂转至当地人民医院住院治疗,胸部CT示“双肺间质病变并感染”,予“比阿培南+利奈唑胺”抗感染,症状无改善,现为求进一步诊治收住我科。起病以来,患者精神稍差,食纳及睡眠可,大小便正常,体重无明显变化。

大夫,我女儿怎么了?

女孩9岁,到北京协和医院就诊时已经病情反复3个月,间断发热1个月。

12岁男孩发热腹痛便血 此病不及时治疗或死于急性肾衰

溶血尿毒综合征(hemolytic uremic syndrome,HUS)系一种伴有红细胞形态异常,临床以溶血性贫血、血小板减少及急性肾衰竭为特征的综合征。在婴幼儿多见,其前驱症状多有发热、腹痛与便血。若发生在年长儿,不伴有前驱症状。溶血尿毒综合征患儿均急骤发病,病死率高,若不早期诊治,常可危及生命。本病无特殊疗法,病死率曾高达77%。近年来,由于综合疗法,特别是早期血浆置换的应用,病死率已下降