Immunogenicity and Safety of Sequential Immunization of Recombinant SARS-CoV-2 Fusion Protein Vaccine

This is a Randomized, Double Blind, Positive Control exploratory clinical study. 150 participants aged 18 years and older who have completed the 2 doses of administration of inactive vaccines 6 months (±1 month) ago were enrolled in this study to evaluate the safety and immunogenicity of V-01. The participants will be enrolled to test group A (V-01 10 μg), test group B (V-01 25 μg) and test group C (inactivated vaccine) by the ratio of 1:1:1. The participants received 1 dose of V-01 or inactivated vaccine base on the group. The random stratification factor is age (18-59 years old vs. ≥ 60 years old).