Immunogenicity and safety of a recombinant COVID-19 vaccine (ZF2001) as heterologous booster after priming with inactivated vaccine in healthy children and adolescents aged 3-17 ye... oleh Tao Huang, Qianqian Hu, Xiang Zhou, Huaiyu Yang, Wei Xia, Feng Cao, Minglu Deng, Xiaoxue Teng, Fan Ding, Zaixin Zhong, Lidong Gao, Jiufeng Sun, Lihui Gong