Clinical Trial to Evaluate the Efficacy, Immunogenicity and Safety of the Inactivated SARS-CoV-2 Vaccine (COVID-19)

Immunization schedule: 2-doses of investigational vaccine or placebo are inoculated to the deltoid muscle of the upper arm according to the immunization schedule of Day 0, 21.

Immunization schedule: 2-doses of investigational vaccine or placebo are inoculated to the deltoid muscle of the upper arm according to the immunization schedule of Day 0, 21.