{"nct_id":"NCT04975893","title":"A Long-Term Extension Study to Evaluate the Immunogenicity and Safety of Cytomegalovirus (CMV) mRNA-1647 Vaccine","status":"ENROLLING_BY_INVITATION","status_verified_date":"2025-05","start_date":"2021-06-18","start_date_type":"ACTUAL","primary_completion_date":"2026-12-30","primary_completion_date_type":"ESTIMATED","completion_date":"2026-12-30","completion_date_type":"ESTIMATED","phases":["PHASE2"],"tickers":["MRNA"]}