【摘 要】
：
本研究对2010年在湖北活禽市场监测分离到的两株鸭源H5N1亚型禽流感病毒(AIV) (HuB/495/10和HuB/513/10)进行了序列分析和致病性试验研究,以了解湖北地区H5N1亚型AIV的生物学
【机 构】
：
甘肃农业大学,甘肃兰州 730070中国农业科学院哈尔滨兽医研究所兽医生物技术国家重点实验室/农业部动物流感重点实验室,黑龙江哈尔滨 150001;中国农业科学院哈尔滨兽医研究所兽医生物技术国家重点实
【基金项目】
：
国家重点基础研究发展规划(973计划);
论文部分内容阅读
本研究对2010年在湖北活禽市场监测分离到的两株鸭源H5N1亚型禽流感病毒(AIV) (HuB/495/10和HuB/513/10)进行了序列分析和致病性试验研究,以了解湖北地区H5N1亚型AIV的生物学特性差异.序列分析显示:2株病毒全基因组核苷酸同源性在97.3 ％～98.6％,2株病毒的8个节段基因均与青海和香港分离的野鸟源病毒A/great crested-grebe/Qinghai/1/2009 (H5N1)和A/black-crowned night heron/Hong Kong/659/2008 (H5N1)的核苷酸高度同源,HA蛋白裂解位点序列基序为341RRRKR345,呈现典型的高致病力分子特征.以105 EID50/100 μL病毒剂量感染4周龄SPF鸭发现:HuB/495/10和HuB/513/10对鸭的致死率分别为100％和20％,病毒在鸭体内呈全身性复制并可通过呼吸道和消化道向外排毒；不同滴度的病毒感染6周龄BALB/c小鼠,HuB/495/10和HuB/513/10的MLD50分别为1.38 log10 EID50和1.68 log10 EID50,对小鼠表现为高致病力,均在肺脏中高拷贝复制.
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