Immunogenicity and safety of a COVID-19 DNA vaccine in healthy adults and elderly: A randomized, observer-blind, placebo-controlled phase 2 trial von Jia, Siyue, Shao, Chengwei, Cheng, Xin, Pan, Hongxing, Wang, Zhijian, Xia, Yu, Xu, Jianfang, Huai, Xuefen, Leng, Danjing, Wang, Jiarong, Zhao, Gan, Wang, Bin, Li, Jingxin, Zhu, Fengcai

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