ZF2001. A Phase III Randomized, Double-blind, Placebo-controlled Clinical Trial in 18 years of age and Above to Determinate the Safety and Efficacy of ZF2001. A Recombinant Novel Coronavirus Vaccine ( CHO cell ) for Prevention of COVID-19 ANZHUI-ZHIFEI BIOPHARMACEUTICALS Co.Ltd 2020-2022 (Ongoing)