{"nct_id":"NCT00503529","title":"TBE Antibody Persistence and Booster Vaccination Study in Adults (Follow-up to Study 223)","status":"COMPLETED","status_verified_date":"2015-05","start_date":"2007-07","start_date_type":null,"primary_completion_date":"2010-07","primary_completion_date_type":"ACTUAL","completion_date":"2010-09","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["PFE"]}