A tandem-repeat dimeric RBD protein-based COVID-19 vaccine ZF2001 protects mice and nonhuman primates

Yaling An, Shihua Li, Xiyue Jin, Jian-bao Han, Kun Xu, Senyu Xu, Yuxuan Han, Chuanyu Liu, Tianyi Zheng, Mei Liu, Mi Yang, Tian-zhang Song, Baoying Huang, Li Zhao, Wen Wang, A Ruhan, Yingjie Cheng, Changwei Wu, Enqi Huang, Shilong Yang, Gary Wong, Yuhai Bi, Changwen Ke, Wenjie Tan, Jinghua Yan … & George F. Gao
Safe, efficacious and deployable vaccines are urgently needed to control COVID-19 in the large-scale vaccination campaigns. We report here the preclinical studies of an approved protein subunit vaccine against COVID-19, ZF2001, which contains tandem-repeat dimeric receptor-binding domain (RBD) protein with alum-based adjuvant. We assessed vaccine immunogenicity and efficacy in both mice and non-human primates (NHPs). ZF2001 induced high levels of RBD-binding and SARS-CoV-2 neutralizing antibody in both mice and non-human primates, and elicited balanced TH1/TH2...
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