Evaluation of the safety and protection efficacy of an attenuated genotype vii newcastle disease virus strain as a candidate vaccine

文献类型： 外文期刊

第一作者： Xu, Xiaohong

作者： Xu, Xiaohong;Li, Jindou;Ding, Jiaxin;Yang, Mingxi;Cong, Yanlong;Yin, Renfu;Ding, Zhuang;Xu, Xiaohong;Jin, Ningyi;Qian, Jing;Xue, Cong;Wang, Jianzhong

作者机构：

关键词： Newcastle disease; Genotype VII; Safety; Protective efficacy; Attenuated candidate vaccine

期刊名称：MICROBIAL PATHOGENESIS （ 影响因子：3.738； 五年影响因子：3.663 ）

ISSN： 0882-4010

年卷期： 2020 年 139 卷

页码：

收录情况： SCI

摘要： Newcastle disease (ND) is a serious avian infectious disease, causing severe economic loss worldwide. Its prevention depends on comprehensive vaccination scheme against Newcastle disease virus (NDV). However, current vaccine strains are of different genotypes with prevalent circulating strains (genotype VII), with significant genetic distance. Our team previously generated a genotype matched attenuated NDV strain (rmNA-1). In this study, its safety and immunization efficacy were evaluated. Its lentogenic characteristic was stable for 25 generations in embryonated chicken eggs and for six generations in SPF chickens. Overdosed administration did not cause any clinical signs or pathogenic changes in chickens. As to its immunization effect, rmNA-1 stimulated a comparable serum NDV specific antibody level to a LaSota (genotype II) strain based commercial vaccine, and provided full protection against virulent genotype VII strain challenge, with significantly reduced virus shedding period.

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