{"nct_id":"NCT04551677","title":"Annual Study for Collection of Serum Samples in Children and Older Adults Receiving the 2020-2021 Formulations of Fluzone Quadrivalent Vaccine and Fluzone High-Dose Quadrivalent Vaccine, Respectively","status":"COMPLETED","status_verified_date":"2025-09","start_date":"2020-09-16","start_date_type":"ACTUAL","primary_completion_date":"2020-12-18","primary_completion_date_type":"ACTUAL","completion_date":"2020-12-18","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["SNY"]}