{"nct_id":"NCT04927065","title":"A Study to Evaluate the Immunogenicity and Safety of mRNA Vaccine Boosters for SARS-CoV-2 (COVID-19) Variants","status":"COMPLETED","status_verified_date":"2025-02","start_date":"2021-05-28","start_date_type":"ACTUAL","primary_completion_date":"2023-11-17","primary_completion_date_type":"ACTUAL","completion_date":"2023-11-17","completion_date_type":"ACTUAL","phases":["PHASE2","PHASE3"],"tickers":["MRNA"]}