Q. A 61-year-old man comes to the outpatient clinic with complaints of a fever for 4 days. The fever has been associated with palpitations, and with one attack of transient loss of consciousness. The patient's medical history is significant for diabetes and hypertension. Vital signs show his blood pressure is 105/60 mm Hg, heart rate 113/min, respiratory rate 15/min, and his temperature is 38.8 degrees Celsius. Cardiac examination reveals a new onset early diastolic murmur over the aortic area. Echocardiography shows aortic regurgitation with a large vegetation on the right aortic cusp. Blood cultures grow Streptococcus bovis. Which of the following additional pieces of medical history would you expect to find in this patient?