Protective Efficacy of an H5N1 Inactivated Vaccine Against Challenge with Lethal H5N1, H5N2, H5N6, and H5N8 Influenza Viruses in Chickens
文献类型: 外文期刊
第一作者: Tian, Guobin
作者: Tian, Guobin;Chen, Hualan
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关键词: avian influenza;H5N1 subtype;clade 2.3.4.4;inactivated vaccine;protective efficacy
期刊名称:AVIAN DISEASES ( 影响因子:1.577; 五年影响因子:1.915 )
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收录情况: SCI
摘要: The Goose/Guangdong-lineage H5 viruses have evolved into diverse clades and subclades based on their hemagglutinin (HA) gene during their circulation in wild birds and poultry. Since late 2013, the clade 2.3.4.4 viruses have become widespread in poultry and wild bird populations around the world. Different subtypes of the clade 2.3.4.4 H5 viruses, including H5N1, H5N2, H5N6, and H5N8, have caused vast disease outbreaks in poultry in Asia, Europe, and North America. In this study, we developed a new H5N1 inactivated vaccine by using a seed virus (designated as Re-8) that contains the HA and NA genes from a clade 2.3.4.4 virus, A/chicken/Guizhou/4/13(H5N1) (CK/GZ/4/13), and its six internal genes from the high-growth A/Puerto Rico/8/1934 (H1N1) virus. We evaluated the protective efficacy of this vaccine in chickens challenged with one H5N1 clade 2.3.2.1b virus and six different subtypes of clade 2.3.4.4 viruses, including H5N1, H5N2, H5N6, and H5N8 strains. In the clade 2.3.2.1b virus DK/GX/S1017/13-challenged groups, half of the vaccinated chickens shed virus through the oropharynx and two birds (20%) died during the observation period. All of the control chickens shed viruses and died within 6 days of infection with challenge virus. All of the vaccinated chickens remained healthy following challenge with the six clade 2.3.4.4 viruses, and virus shedding was not detected from any of these birds; however, all of the control birds shed viruses and died within 4 days of challenge with the clade 2.3.4.4 viruses. Our results indicate that the Re-8 vaccine provides protection against different subtypes of clade 2.3.4.4 H5 viruses.
分类号: R36
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