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Clinical Trial Summary

The primary objectives of the study are: To assess the safety profile of the study vaccines in each study intervention group. To assess the neutralizing antibody profile after primary series vaccination in SARS-CoV-2-naïve adults. To demonstrate that a booster dose of monovalent or bivalent SARS-CoV-2 vaccine given to adults previously vaccinated with an authorized/approved COVID-19 vaccine induces an immune response that is non-inferior to the response induced by a twodose priming series with the monovalent vaccine, and superior to that observed immediately before booster. The secondary objectives of the study are: To assess the neutralizing and binding antibody profiles after primary series vaccination at pre-defined time points during the study. To assess the neutralizing and binding antibody responses of booster vaccination. To describe the occurrences of laboratory-confirmed symptomatic COVID19 after primary series and booster vaccination. To describe the occurrences of serologically-confirmed SARS-CoV-2 infection after primary series vaccination.


Clinical Trial Description

The duration of each participant's participation in the study will be approximately: Original Phase 2 part: 365 days postinjection 2 (ie, 386 days total). Supplemental Cohorts 1 and 2: 365 days post-booster injection (ie, 366 days total). ;


Study Design


Related Conditions & MeSH terms


NCT number NCT04762680
Study type Interventional
Source Sanofi
Contact
Status Active, not recruiting
Phase Phase 2/Phase 3
Start date February 24, 2021
Completion date July 16, 2024

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