(A) Prevention Arm: SARS-CoV-2 positivity assesed up to day 60.;(B) Treatment Arm: COVID 19 related hospitalization (indication for hospitalization per the blinded investigator or actual hospitalization) or death assessed up to 28 days

(A) Prevention Arm: SARS-CoV-2 positivity assesed up to day 60.;(B) Treatment Arm: COVID 19 related hospitalization (indication for hospitalization per the blinded investigator or actual hospitalization) or death assessed up to 28 days

(A) Prevention Arm: Highest mean WHO descriptive score of COVID-19 in hospitalized patients in the active treatment group compared to the placebo group;(A) Prevention Arm: Percentage of SARS-CoV-2 positive subjects in the active treatment group compared to the placebo group.;(B) Treatment Arm: Percentage of subjects who required hospitalization or died until day 28 in the active treatment group compared to the placebo group.

(A) Prevention Arm: Highest mean WHO descriptive score of COVID-19 in hospitalized patients in the active treatment group compared to the placebo group;(A) Prevention Arm: Percentage of SARS-CoV-2 positive subjects in the active treatment group compared to the placebo group.;(B) Treatment Arm: Percentage of subjects who required hospitalization or died until day 28 in the active treatment group compared to the placebo group.

Percentage of SARS-CoV-2 positive subjects;Highest mean WHO descriptive score of COVID-19 in the active treatment group compared to the placebo group.

Percentage of SARS-CoV-2 positive subjects;Highest mean WHO descriptive score of COVID-19 in the active treatment group compared to the placebo group.