[ Objective] The aim of this study was to determine and analyze the pathogen and the reasons of duck viral hepatitis which is prevalent recently and difficult to control. [Method] Viruses were isolated from livers and...[ Objective] The aim of this study was to determine and analyze the pathogen and the reasons of duck viral hepatitis which is prevalent recently and difficult to control. [Method] Viruses were isolated from livers and spleens of ducks with typical clinical symptoms in Linyi, Weifang, Binzhou and other regions of Shandong Province. The pathogenic characteristics were observed by inoculation in chicken or duck embryo, RT- PCR, serological test, and duck regression. [ Result] Four duck hepatitis virus (DHV) strains were isolated, and the 5th passage allantoic fluid contained 10^3.41 -10^5.20 ELD50/mI. The serum cross protection rate was 20% -80% between the DHV stains and DHV type I. The mortalities of 4- day-old healthy ducks challenged by these four stains were 50% -100%. All challenged ducks had typical lesions of duck viral hepatitis, and the death peak appeared after 24-48 h. [Conclusion] The virulence of different DHV isolates has regional difference.展开更多
【目的】探明引起安徽某鸭场雏鸭肝脏出血和大量死亡的病原及其遗传进化特征。【方法】对安徽省某鸭场的病死雏鸭中采集的出血肝脏开展鸭已知病原核酸检测、病原分离鉴定和动物回归试验,在明确其病原为鸭3型甲肝病毒(Duck hepatitis A v...【目的】探明引起安徽某鸭场雏鸭肝脏出血和大量死亡的病原及其遗传进化特征。【方法】对安徽省某鸭场的病死雏鸭中采集的出血肝脏开展鸭已知病原核酸检测、病原分离鉴定和动物回归试验,在明确其病原为鸭3型甲肝病毒(Duck hepatitis A virus type 3,DHAV-3)的基础上分析其VP1基因序列分子特征。【结果】细菌分离结果显示,未分离到细菌;经病毒核酸(RT-)PCR检测结果显示,鸭3型甲肝病毒(DHAV-3)核酸阳性,未检测出其他已知引起鸭肝出血的病毒核酸。将该阳性样品经鸭胚进行病毒分离与传代,发现接种后鸭胚发生死亡,胚体全身出血,对第5代尿囊液经RT-PCR检测为DHAV-3,将其命名为AH230225。经测定,该分离株的鸭胚半数致死量(Effective lethal dose 50,ELD_(50))为10^(−4.17)/0.1 mL。动物回归试验表明,该毒株对樱桃谷雏鸭的致死率为80%,且攻毒死亡鸭肝脏和肾脏的剖检病变与临床典型病变相近。对该分离毒的VP1基因核苷酸序列进行同源性分析,显示AH230225株的VP1基因核苷酸序列与AH07株DHAV-3(安徽分离株)的同源性最高,为98.8%,与GenBank登录的10株DHAV-3分离株VP1基因核苷酸序列同源性为90.4%~98.8%,而与DHAV-1和DHAV-2的VP1基因核苷酸序列同源性分别为62.1%~63.0%、64.6%~64.9%;基于VP1蛋白氨基酸序列的遗传进化显示,该分离株与AH07株DHAV-3处于同一小进化分支上,亲缘关系最近;而与SD01株、G株和韩国株(AP-04009、AP-03337)等亲缘关系较远,即远离DHAV-1和DHAV-2进化分支。【结论】引起安徽某鸭场雏鸭肝脏出血和大量死亡的病原为鸭3型甲肝病毒DHAV-3,同时明确了该毒株VP1基因的分子特征及遗传进化规律,为深入研究DHAV-3的致病机制和制定防控措施提供科学依据。展开更多
对江苏地区分离到的1株疑似鸭肝炎病毒毒株(JS株)进行传代繁殖、雏鸭回归试验和理化性能测定,结果表明,该毒株能在鸭胚上进行传代繁殖,E1-E6代鸭胚毒的ELD50为104.38·0.2 m L^-1-106.17·0.2m L^-1;攻毒的雏鸭可产生与I型鸭...对江苏地区分离到的1株疑似鸭肝炎病毒毒株(JS株)进行传代繁殖、雏鸭回归试验和理化性能测定,结果表明,该毒株能在鸭胚上进行传代繁殖,E1-E6代鸭胚毒的ELD50为104.38·0.2 m L^-1-106.17·0.2m L^-1;攻毒的雏鸭可产生与I型鸭肝炎病毒相同的症状和病变;3,7,14日龄易感雏鸭的LD50分别为105.5·0.2 m L^-1,105.17·0.2 m L^-1,103.83·0.2 m L^-1;病毒对氯仿、乙醚和胰酶不敏感,对酸(p H 3.0)稳定,对热不稳定。进一步进行交叉中和试验、交叉被动保护试验和VP1基因序列分析,结果显示,该毒株的抗原性与经典1型DHV差异显著;VP1序列与多株1型DHV的同源性在69.3%-93.3%;从进化关系来看,与韩国株的亲缘性最近。JS株属于我国流行的新型鸭肝炎病毒(命名为N-DHV-JS株)。展开更多
采自淄博市的桓台、高青、临淄疑似鸭病毒性肝炎且临床病理变化明显的病死雏鸭肝脏,经病毒分离、鸡胚接种、病毒纯化后,进行了鸡胚中和试验、氯仿敏感试验、分离毒株ELD50测定及动物回归试验。经测定3株病毒毒价分别为105.3、105.6、105...采自淄博市的桓台、高青、临淄疑似鸭病毒性肝炎且临床病理变化明显的病死雏鸭肝脏,经病毒分离、鸡胚接种、病毒纯化后,进行了鸡胚中和试验、氯仿敏感试验、分离毒株ELD50测定及动物回归试验。经测定3株病毒毒价分别为105.3、105.6、105.10.2 mL ELD50。3株分离病毒经动物回归试验,对1日龄雏鸭的致死率分别为75%、87.5%和75%,而且出现了雏鸭病毒性肝炎的典型症状,呈明显的角弓反张姿态,病死鸭剖检可见肝脏肿胀,质脆易碎,肝脏有深紫红色的出血点或出血斑。结果证实分离到的病毒为Ⅰ型鸭肝炎病毒。展开更多
基金funded by the Technology Development Program of Chengyang District of Qingdao City (2008-4-sf)
文摘[ Objective] The aim of this study was to determine and analyze the pathogen and the reasons of duck viral hepatitis which is prevalent recently and difficult to control. [Method] Viruses were isolated from livers and spleens of ducks with typical clinical symptoms in Linyi, Weifang, Binzhou and other regions of Shandong Province. The pathogenic characteristics were observed by inoculation in chicken or duck embryo, RT- PCR, serological test, and duck regression. [ Result] Four duck hepatitis virus (DHV) strains were isolated, and the 5th passage allantoic fluid contained 10^3.41 -10^5.20 ELD50/mI. The serum cross protection rate was 20% -80% between the DHV stains and DHV type I. The mortalities of 4- day-old healthy ducks challenged by these four stains were 50% -100%. All challenged ducks had typical lesions of duck viral hepatitis, and the death peak appeared after 24-48 h. [Conclusion] The virulence of different DHV isolates has regional difference.
文摘【目的】探明引起安徽某鸭场雏鸭肝脏出血和大量死亡的病原及其遗传进化特征。【方法】对安徽省某鸭场的病死雏鸭中采集的出血肝脏开展鸭已知病原核酸检测、病原分离鉴定和动物回归试验,在明确其病原为鸭3型甲肝病毒(Duck hepatitis A virus type 3,DHAV-3)的基础上分析其VP1基因序列分子特征。【结果】细菌分离结果显示,未分离到细菌;经病毒核酸(RT-)PCR检测结果显示,鸭3型甲肝病毒(DHAV-3)核酸阳性,未检测出其他已知引起鸭肝出血的病毒核酸。将该阳性样品经鸭胚进行病毒分离与传代,发现接种后鸭胚发生死亡,胚体全身出血,对第5代尿囊液经RT-PCR检测为DHAV-3,将其命名为AH230225。经测定,该分离株的鸭胚半数致死量(Effective lethal dose 50,ELD_(50))为10^(−4.17)/0.1 mL。动物回归试验表明,该毒株对樱桃谷雏鸭的致死率为80%,且攻毒死亡鸭肝脏和肾脏的剖检病变与临床典型病变相近。对该分离毒的VP1基因核苷酸序列进行同源性分析,显示AH230225株的VP1基因核苷酸序列与AH07株DHAV-3(安徽分离株)的同源性最高,为98.8%,与GenBank登录的10株DHAV-3分离株VP1基因核苷酸序列同源性为90.4%~98.8%,而与DHAV-1和DHAV-2的VP1基因核苷酸序列同源性分别为62.1%~63.0%、64.6%~64.9%;基于VP1蛋白氨基酸序列的遗传进化显示,该分离株与AH07株DHAV-3处于同一小进化分支上,亲缘关系最近;而与SD01株、G株和韩国株(AP-04009、AP-03337)等亲缘关系较远,即远离DHAV-1和DHAV-2进化分支。【结论】引起安徽某鸭场雏鸭肝脏出血和大量死亡的病原为鸭3型甲肝病毒DHAV-3,同时明确了该毒株VP1基因的分子特征及遗传进化规律,为深入研究DHAV-3的致病机制和制定防控措施提供科学依据。
文摘对江苏地区分离到的1株疑似鸭肝炎病毒毒株(JS株)进行传代繁殖、雏鸭回归试验和理化性能测定,结果表明,该毒株能在鸭胚上进行传代繁殖,E1-E6代鸭胚毒的ELD50为104.38·0.2 m L^-1-106.17·0.2m L^-1;攻毒的雏鸭可产生与I型鸭肝炎病毒相同的症状和病变;3,7,14日龄易感雏鸭的LD50分别为105.5·0.2 m L^-1,105.17·0.2 m L^-1,103.83·0.2 m L^-1;病毒对氯仿、乙醚和胰酶不敏感,对酸(p H 3.0)稳定,对热不稳定。进一步进行交叉中和试验、交叉被动保护试验和VP1基因序列分析,结果显示,该毒株的抗原性与经典1型DHV差异显著;VP1序列与多株1型DHV的同源性在69.3%-93.3%;从进化关系来看,与韩国株的亲缘性最近。JS株属于我国流行的新型鸭肝炎病毒(命名为N-DHV-JS株)。
文摘采自淄博市的桓台、高青、临淄疑似鸭病毒性肝炎且临床病理变化明显的病死雏鸭肝脏,经病毒分离、鸡胚接种、病毒纯化后,进行了鸡胚中和试验、氯仿敏感试验、分离毒株ELD50测定及动物回归试验。经测定3株病毒毒价分别为105.3、105.6、105.10.2 mL ELD50。3株分离病毒经动物回归试验,对1日龄雏鸭的致死率分别为75%、87.5%和75%,而且出现了雏鸭病毒性肝炎的典型症状,呈明显的角弓反张姿态,病死鸭剖检可见肝脏肿胀,质脆易碎,肝脏有深紫红色的出血点或出血斑。结果证实分离到的病毒为Ⅰ型鸭肝炎病毒。