Consider the following medical report that includes the patient's historical health records. Use it to predict the disease that the patient is high likely exposed to. 

 Medical Report: history of present illness: this is a patient who has been in the hospital since , who was on the medical service and has subsequently been transferred to the cardiothoracic surgery service for an aortic valve replacement. please see previous discharge summary for the time period of to . this is a 31-year-old male who came into the hospital on with a chief complaint of requesting detoxification. the patient also complained of some abdominal pain on admission, and was noted to have a fever of 104 farenheit, a white count of 17. at that time, physical examination was remarkable for osler's nodes. blood cultures subsequently grew methicillin-sensitive staphylococcus aureus in four out of four bottles. ct scan of the abdomen at that time showed a small wedge-shaped perfusion defect in the kidneys bilaterally, and also wedge-shaped triangular low attenuation areas in the spleen, which were consistent with septic emboli. transesophageal echocardiogram showed a vegetation on the aortic valve, and aortic insufficiency of 2+. after sensitivities returned, the patient was started and continued on oxacillin. a subsequent transesophageal echocardiogram performed on the showed perivalvular abscess and fistulous tract between the right ventricle and the aorta. an mri of the head was done in order to rule out septic emboli. there was no evidence of mycotic aneurysms. in addition, secondary to the patient's poor dentition, an oral surgery consult determined that it would be beneficial to the patient's valve replacement if he had 18 of his teeth removed, which was performed under general anesthesia. the patient was also tested for hiv, hepatitis c and b, all of which were negative. the patient was started on methadone for heroin withdrawal, and, at the time the patient was admitted to the cardiothoracic surgery service, he had been tapered down to 30 mg by mouth once daily. on admission, the patient's hematocrit was 37, and declined down to 23 to 24 at his lowest. subsequent anemia workup was consistent with iron-deficiency anemia with likely overlying anemia of chronic disease. the patient was started on iron and also transfused one unit prior to being transferred to the cardiothoracic surgery service. stool guaiacs were negative with one exception, which showed trace positivity. the patient was preopped on . there were no acute st changes, and creatinine was 0.8, and hematocrit 25.1. on physical examination, the patient was found to have occasional crackles, and was subsequently given 10 mg of intravenous lasix, to which he responded with good diuresis. on , the patient was brought to the operating room, at which time an aortic valve replacement and repair of right ventricular aortic abscess was performed. the homograft was a #23 mm. at that time, two arterial lines were placed intraoperatively, as well as a swan-ganz catheter. two ventricular wires and two atrial wires were also placed, as well as two mediastinal and one left pleural chest tube. the patient was on cardiopulmonary bypass for 217 minutes, and was cross-clamped for 180 minutes. intraoperatively, it was found that the patient had underlying block and was postoperatively av paced. postoperatively, the patient was transferred to the csru, and remained intubated. on postoperative day number one, the patient was extubated and maintained a blood gas on cpap of 7.43/41/77/28/2. the patient's nitroprusside was weaned with some slight hypertension. the patient remained ventricular paced at 70. the patient was subsequently found to be stable, with a blood pressure in the 120s and saturating at 98% on 4 liters nasal cannula. the patient continued to be ventricular paced, at which time eps was consulted. the patient was also noted to have transient increase in his creatinine at around 2.1, which plateaued at that number and slowly declined to a final creatinine on discharge of 1.3. in the interim, the infectious disease service, who had been following the patient since his admission, cleared him to have a permanent pacemaker placed, as the patient's blood cultures had been negative up until that point. a picc line was placed on the 18th in the right arm for long-term intravenous oxacillin, which is to end . on , a permanent pacemaker was placed, and postoperatively he was placed on vancomycin for 48 hours. chest x-ray confirmed interval placement of a dual-chamber pacemaker. the pacemaker leads clearly terminated in the right atrium and the right ventricle respectively. the picc line was also readjusted at that point. on , postoperative day number eight, the patient was found to be in stable condition status post a homograft aortic valve replacement as well as a right ventricular aortic abscess repair, as well as permanent pacemaker and a picc line. he was discharged in good condition, and his methadone dose had been tapered down to 5 mg by mouth once daily for pain control. discharge medications: 1. lopressor 25 mg by mouth twice a day 2. colace 100 mg by mouth twice a day 3. oxacillin 2 grams intravenously qh for three weeks 4. zantac 150 mg by mouth once daily 5. methadone 5 mg by mouth once daily condition at discharge: good. discharge disposition: home. follow-up plans: the patient is to follow up with dr. in four weeks. the patient is to follow up with dr. in the infectious disease clinic on , at 9:30 a.m., and the patient is to follow up at the clinic. , m.d. dictated by: medquist36 procedure: venous catheterization, not elsewhere classified extracorporeal circulation auxiliary to open heart surgery diagnostic ultrasound of heart other esophagoscopy initial insertion of dual-chamber device initial insertion of transvenous leads [electrodes] into atrium and ventricle open and other replacement of aortic valve with tissue graft extraction of other tooth other operations on vessels of heart other and unspecified repair of ventricular septal defect diagnoses: congestive heart failure, unspecified aortic valve disorders opioid type dependence, unspecified atrioventricular block, complete bacteremia methicillin susceptible staphylococcus aureus in conditions classified elsewhere and of unspecified site acute and subacute bacterial endocarditis drug withdrawal 

Answer: The patient is high likely exposed to