{"nct_id":"NCT00518492","title":"Study Evaluating the Duration of Immunity in Healthy Adult Volunteers Who Completed Study 6108A1-500","status":"COMPLETED","status_verified_date":"2009-09","start_date":"2007-08","start_date_type":null,"primary_completion_date":"2008-04","primary_completion_date_type":"ACTUAL","completion_date":"2008-04","completion_date_type":"ACTUAL","phases":["PHASE1"],"tickers":["PFE"]}