Immunogenicity and protective efficacy of DHBV DNA vaccines expressing envelope and capsid fusion proteins in ducks delivered by attenuated Salmonella typhimurium by Si-yang LIU, Ren-yong JIA, Qing-qing LI, Dai-shen FENG, Hao-yue SHEN, Cui YANG, Ming-shu WANG, De-kang ZHU, Shun CHEN, Ma-feng LIU, Xin-xin ZHAO, Zhong-qiong YIN, Bo JING, An-chun CHENG

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