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: patient is a 77-year-old gentleman with a history of afib and hypertension, who is status post a bicycle accident, where he suffered a concussion over two months ago. he reports problems from the accident including headaches, diplopia, and vertigo have improved other than fatigue. he and the son have noticed that he has become slow and more fatigued. the patient's voice has become softer. his gait is starting to shuffle. the son noticed that he is slower in initiating or changing motor movements. the patient denies any resting tremor or urinary incontinence, although he is urinating much more frequently recently. he had a single fall while walking the when he slipped on a wet log with no other falls. he denies feeling depressed. denies any changes in appetite or sleep pattern. physical examination: on physical exam, he is an elderly man in no acute distress. he is alert and oriented with normal language and memory. eoms are full. pupils are equal, round, and reactive to light. he has no ptosis. his face is symmetric. his tongue is midline. he has no drift, no resting tremor, some mild paratonia in the arms and legs, but no cogwheeling even with distractions. however, his give-way and effort dependent throughout. he has no specific pattern with impairment, although weakest muscles are iliopsoas at 4-/5. fine finger movements are rapid and precise. his deep tendon reflexes are 1+ in the arms and 1+ at the knees. trace ankles and toes are downgoing. gait has difficulty initiating movements. needs arms to get up out of a chair. head ct initially after the accident showed small bilateral frontal hygromas and a slight subarachnoid hemorrhage. on the 19th, he has got a large hygroma with subdural hemorrhage located within the subfalcine, subfalcine herniation . the patient was taken to the operating room for evacuation of the subdural hematoma, which he tolerated without complication. his vital signs remained stable. postoperative, he is awake, alert, and oriented times three, moving all extremities with good strength with a subtle left drift, subtle left sided weakness. his vital signs remained stable. he did have a right frontal-parietal crani for evacuation of the subdural. he was monitored in the icu postoperatively, and transferred to the regular floor on postoperative day one. he was seen by physical therapy and occupational therapy, and found to be safe for discharge to rehab. medications at time of discharge: 1. milk of magnesia 30 cc p.o. q.6h. prn. 2. atenolol 25 mg p.o. q.d. 3. percocet 1-2 tablets p.o. q.4-6h. prn. 4. .................... 7.5 mg p.o. q.d. 5. zantac 150 mg p.o. b.i.d. 6. fluoxetine 10 mg p.o. q.d. 7. senna one tablet p.o. b.i.d. prn. 8. .................... bromide inhaler two puffs q.i.d. 9. colace 100 mg p.o. b.i.d. condition on discharge: the patient's condition was stable at the time of discharge. follow-up instructions: he will follow up with dr. in one month with a repeat ct. staples should be removed on postoperative day #10. surgery was on . , m.d. dictated by: medquist36 d: 11:26 t: 11:36 job#: procedure: incision of cerebral meninges intravascular imaging of intrathoracic vessels diagnoses: unspecified essential hypertension atrial fibrillation subdural hemorrhage following injury without mention of open intracranial wound, with brief [less than one hour] loss of consciousness pedal cycle accident injuring pedal cyclist 

Answer: The patient is high likely exposed to