Yang S, Li Y, Dai L, Wang J, et al. Safety and immunogenicity of a recombinant tandem-repeat dimeric RBD-based protein subunit vaccine (ZF2001) against COVID-19 in adults: two randomised, double-blind, placebo-controlled, phase 1 and 2 trials. Lancet Infect Dis 2021 Mar 24. pii: S1473-3099(21)00127.
PMID: 33773111