{"nct_id":"NCT04024228","title":"Study to Assess the Immune Response and the Safety Profile of a High-Dose Quadrivalent Influenza Vaccine (QIV-HD) Compared to a Standard-Dose Quadrivalent Influenza Vaccine (QIV-SD) in Europeans Adults 60 Years of Age and Older","status":"COMPLETED","status_verified_date":"2025-09","start_date":"2019-10-28","start_date_type":"ACTUAL","primary_completion_date":"2020-01-09","primary_completion_date_type":"ACTUAL","completion_date":"2020-06-05","completion_date_type":"ACTUAL","phases":["PHASE3"],"tickers":["SNY"]}