{"nct_id":"NCT05050318","title":"Annual Study for Collection of Serum Samples in Children and Older Adults Receiving the 2021-2022 Formulations of Fluzone Quadrivalent Vaccine and Fluzone High-Dose Quadrivalent Vaccine, Respectively","status":"COMPLETED","status_verified_date":"2025-09","start_date":"2021-09-08","start_date_type":"ACTUAL","primary_completion_date":"2021-11-10","primary_completion_date_type":"ACTUAL","completion_date":"2021-11-10","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["SNY"]}