Efficacy, Safety, and Immunogenicity of Two Vaccination Schedules of an Inactivated Vaccine Against COVID-19 in Adults

This study will evaluate the efficacy, safety, and immunogenicity of two vaccination schedules of an inactivated vaccine against SARS-CoV-2 infection in adults. This study will be performed in 8 centers. Two schedules will be compared: 0,14 and 0,28-day, at a 1:1 rate. 40% of participants will be 60 or more years-old. Follow-up of safety and efficacy will be assessed for 12 months after administering the first dose. The collection of the data will be through an electronic Case Report Form. Immunogenicity will be studied in a subgroup of participants. Initially, 2,300 volunteers will be recruited.