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: a 75-year-old male with a 3-month history of chest discomfort and throat tightness, which during his workup revealed mitral regurgitation. cardiac catheterization showed normal coronaries with an ejection fraction of 50% and moderate 2 to 3+ mitral regurgitation. past medical history: past medical history is significant for a permanent pacemaker in for sick sinus syndrome, a abdominal aortic aneurysm repair eight years ago, a hernia repair, eye surgery to his retinae, surgery times two to the left ear, and a recent gastrointestinal bleed requiring 6 units of packed red blood cells. medications on admission: medications prior to admission included prilosec 20 mg p.o. q.d., k-dur 20 meq p.o. q.d., inderal 40 mg p.o. q.d., and lasix 40 mg p.o. q.d., allergies: he is allergic to penicillin from which he gets a rash. social history: he is a retired photographer who lives in with his wife. quit tobacco 15 years ago. no alcohol consumption. physical examination on admission: physical examination prior to admission revealed heart rate 65 regular, blood pressure 135/70, respiratory rate 20, height 5 feet 11 inches, weight 167 pounds. in general, a well-appearing 75-year-old male in no acute distress. skin was intact. heent was unremarkable. neck was supple. breath sounds were clear. heart with s1/s2, with a to 4/6 systolic ejection murmur. abdomen was soft, nontender, and nondistended. extremities were warm and well perfused, varicosities bilaterally of the lower legs. neurologically, grossly intact, 2+ dorsalis pedis, femoral, and radial pulses with 1+ posterior tibialis. no carotid bruits. laboratory on admission: laboratories were pending at the time he was seen. radiology/imaging: electrocardiogram showed a paced rhythm with a rate in the 60s. chest x-ray was also pending. hospital course: the patient was admitted to the operating room on , at which time he underwent a mitral valve replacement with a 31-mm porcine tissue valve. he tolerated the operation well and was transferred from the operating room to the cardiothoracic intensive care unit. at the time of transfer he had an arterial line, a swann-ganz catheter, two ventricular, and two atrial pacing wires, and two mediastinal chest tubes. at the time of transfer he mean arterial pressure was 67, his central venous pressure was 14. he was a-paced at a rate of 74 beats per minute. at that time he had nitroglycerin at 0.1 mcg/kg/min and propofol at 20 mcg/kg/min. the patient did well in the immediate postoperative period. he was weaned from oral cardiac active drugs. his anesthesia was reversed, and he was rapidly weaned from the ventilator and extubated. throughout the remainder of his operative day, he remained hemodynamically stable without bleeding from his chest tubes or incision lines. on postoperative day one, the patient remained hemodynamically stable and was scheduled to be transferred to far six for continued postoperative care and cardiac rehabilitation; however, there were no beds available on the floor, so he remained in the intensive care unit for an additional 24 hours. chest tubes were also removed on postoperative day one. on postoperative day two, the patient again remained hemodynamically stable. he was seen by physical therapy for evaluation and assessment of activity level, and by the end of the day he was transferred to far six for continuing postoperative care. over the next three days, the patient remained hemodynamically stable. his foley catheter, central venous line, and temporary pacing wires were all removed. he continued to progress in his activity level throughout those three days, and on postoperative day five he was deemed stable and ready for discharge to home. of note, on postoperative day three, the patient was seen by cardiology specifically to increase the rate of his permanent pacemaker to 80 beats per minute. physical examination on discharge: at the time of discharge the patient's physical examination was as follows. preoperative weight 76 kg, at discharge 75.8 kg. vital signs were temperature 98.4, heart rate 80 sinus rhythm, blood pressure 130/70, respiratory rate 20, oxygen saturation 96% on room air. on physical examination, alert and oriented times three, moved all extremities, followed commands. breath sounds were clear to auscultation bilaterally. heart sounds with a regular rate and rhythm, s1/s2. no murmurs. abdomen was soft, nontender, and nondistended, normal active bowel sounds. extremities were cool with no edema and palpable dorsalis pedis pulses. laboratory data: white blood cell count 5.4, hematocrit 26.5, platelets 181. sodium 139, potassium 4.4, chloride 101, bicarbonate 30, bun 19, creatinine 0.9, glucose 89. medications on discharge: 1. lasix 20 mg p.o. q.d. times seven days. 2. potassium chloride 20 meq p.o. q.d. times seven days. 3. lopressor 25 mg p.o. b.i.d. 4. prilosec 20 mg p.o. q.d. 5. percocet 5/325 one to two tablets p.o. q.4h. p.r.n. discharge diagnoses: 1. mitral regurgitation, status post mitral valve replacement with a #31 porcine tissue valve. 2. status post permanent pacemaker for sick sinus syndrome. 3. abdominal aortic aneurysm repair. 4. hernia repair. 5. eye surgery. 6. ear surgery. 7. gastrointestinal bleed. discharge followup: the patient was to have followup with dr. in one month. his staples were to be removed the week of by the visiting nurse . , m.d. dictated by: medquist36 procedure: extracorporeal circulation auxiliary to open heart surgery diagnostic ultrasound of heart other esophagoscopy open and other replacement of mitral valve with tissue graft diagnoses: mitral valve disorders cardiac pacemaker in situ 

Answer: The patient is high likely exposed to