{"nct_id":"NCT04137887","title":"Study to Evaluate the Effectiveness of a High-Dose Quadrivalent Influenza Vaccine (QIV-HD) Compared to a Standard-Dose Quadrivalent Influenza Vaccine (QIV-SD) in Adults 65 Years of Age and Older","status":"TERMINATED","status_verified_date":"2025-09","start_date":"2019-11-04","start_date_type":"ACTUAL","primary_completion_date":"2020-05-31","primary_completion_date_type":"ACTUAL","completion_date":"2020-05-31","completion_date_type":"ACTUAL","phases":["PHASE3"],"tickers":["SNY"]}