Immunogenicity and safety of a booster dose of the COVID-19 DNA vaccine in healthy adults aged 18 years and above: a single-center, randomized, observer-blind, placebo-controlled p... by Aihua Yao, Siyue Jia, Xin Cheng, Hongxing Pan, Zhijian Wang, Haitao Yang, Yu Xia, Jianfang Xu, Xuefen Huai, Danjing Leng, Ming Xu, Jiarong Wang, Gan Zhao, Bin Wang, Jingxin Li

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