The study will be carried out in 2 stages. Stage 1 aims to assess the safety and immunogenicity of different doses of BCD-250 in subjects without a history of COVID-19 infection to choose the optimal dose for further investigation.~Stage 2 aims to assess the immunogenicity and safety of the chosen on stage 1 optimal BCD-250 dose compared to placebo in subjects with and without the history of COVID-19 infection.
A randomized, double-blind, placebo-controlled, adaptive, seamless phase I / II clinical study of the safety and immunogenicity of a recombinant viral vector AAV5-RBD-S vaccine for the prevention of coronavirus infection (COVID-19)