Question category: Gastroenterology
A 69 year old male presents with pyrexia of unknown origin. He has no previous medical history. He has had some recent dental work. On examination he is found to be pyrexial with a temperature of 38.5oC. On auscultation of the heart there is evidence of a pansystolic murmur in the apical region. An echo is organised and reveals a vegetation and blood cultures reveal S. bovis. He is started on IV antibiotics. What investigation must be organised for this patient?