{"nct_id":"NCT04999111","title":"A Study of Ad26.COV2.S Administered as Booster Vaccination in Adults Who Have Previously Received Primary Vaccination With Ad26.COV2.S or BNT162b2","status":"COMPLETED","status_verified_date":"2025-01","start_date":"2021-08-06","start_date_type":"ACTUAL","primary_completion_date":"2021-10-27","primary_completion_date_type":"ACTUAL","completion_date":"2022-11-22","completion_date_type":"ACTUAL","phases":["PHASE2"],"tickers":["JNJ"]}