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 an 80-year-old man with a past medical history significant for polymyalgia rheumatica, temporal arteritis, cad status post mi, orthostatic hypotension, possible seizures, dementia, and a history of recurrent c. difficile who presents after episode of "garbled speech" and confusion ("unable to understand how to get into the car") on . head ct on admission showed no hemorrhage, and mri was negative for stroke. exam was felt to be consistent with nonconvulsive status epilepticus on admission, and the patient was sent to the intensive care unit. in the icu eegs were consistent with periodic lateralized epileptiform discharges in left temporal and left parietal regions but no electrographical seizures were recorded. clinically, there were witnesses to a couple of episodes of left arm shaking. he was initially continued on his tegretol then started on depakote (question allergy to dilantin) but more recently changed to keppra. he has had no further witnessed seizures. his hospital course has, however, been complicated by pneumonia (gram negative rods and sputum) for which he is currently covered with levofloxacin and vancomycin. blood cultures and c. diff. samples have so far been negative. he has been stabilized in the icu and sent out to the floor, afebrile, but still with altered mental status. past medical history: 1. hypertension. 2. cad status post mi and rca stent in 08/. 3. polymyalgia rheumatica 4. temporal arteritis. 5. benign prostatic hypertrophy. 6. history of orthostatic hypotension. 7. history of question seizure disorder. 8. anemia. 10. recurrent c. diff. 11. status post lumbar spinal fusion. 12. 12 months of progressive dementia. allergies: question to phenytoin. outpatient medications: 1. iron. 2. atenolol. 3. lisinopril. 4. remeron. 5. risperdal. 6. aspirin. 7. florinef. 8. tegretol. 9. lactobacillus. 10. diclofenac xr. 11. protonix. 12. calcium carbonate. 13. lipitor. social history: lives in a nursing home. baseline is conversant and mobile. had an mvc two years and required rehab and has had progressive dementia for the past 12 months. physical examination: afebrile, blood pressure 104/72. general medical exam: unremarkable. neurologic: awakens with stimulation, and he is alert and follows some commands, such as "open your eyes" and "squeeze my hand then let go." does not show two fingers or protrude tongue. answers simple questions, names. says he is from . relates that he is married. when asked where he is, he says, "i am somewhere down south," and perseverates. cranial nerves: pupils equal, round, reactive to light. extraocular eye muscles intact. able to fix and follow. facial movements symmetric. blinks to threat bilaterally and corneals intact bilaterally. motor normal. bulk tone normal on right but slightly spastic in the left lower extremity. spontaneous movements of all extremities but more so on the right. does lift legs to command. reflexes symmetric except slightly brisker in the left lower extremity. toe downgoing on right, upgoing on left. sensation: localizes to pain in all extremities, though right upper extremity more than left upper extremity and withdraws all extremities briskly to noxious stimuli. laboratory data: white count 11.9, hematocrit 37.7, platelets 224, inr 1.1, ua negative. cerebrospinal fluid on showed 0 white cells, 60 red cells. chem-10 is normal. ruled out for myocardial infarction by enzymes. triglycerides 90, hdl 50, ldl 109, ammonia 19, tsh 0.91. tegretol level on was 6.7. total protein in csf 35, glucose in csf 83. c. diff.: three were negative. fecal cultures also negative. urine cultures negative. blood cultures negative. methicillin-resistant staphylococcus aureus screen negative twice. vancomycin-resistant enterococcus screen negative. sputum grew some gram negative rods on . heparin-dependent antibodies negative. hsv negative in the csf. mri showed no evidence of acute infarction or intracranial hemorrhage. no parenchymal mass lesion noted on post contrast images. symmetric appearance of the hippocampi and temporal lobes without evidence of acute encephalitis. the patient's chest x-ray: serial chest x-ray showed clearing of bilateral infiltrate and atelectasis of the lung bases. cytology was negative for malignant cells of the csf. he showed abnormal portable eeg to the persistent left temporal and left hemisphere sharp waves and due to slow background, first abnormality signifies focal lesion with epileptogenic potential, but the discharges were less frequent and far less rhythmic than on several earlier recordings. no electrographic seizures. slow background indicates widespread encephalopathy. the patient's lfts on : alt 69, ast 28, ld 194, alkaline phosphatase 81. hospital course: the patient was admitted to the neurology service, initially admitted to the intensive care unit because he was thought to be in nonconvulsive status epilepticus. eegs were negative for this. the patient did develop pneumonia during the hospital course but was covered with antibiotics and is now on levaquin for the pneumonia. he continued to improve and required less and less oxygen and now is on nasal cannula on the day of discharge. he initially was obtunded on admission. he does have a history of having episodes of lost consciousness, which has been worked up thoroughly in the past, and the patient was on tegretol on admission. however, this did not seem to be one of those episodes, and it remains unclear exactly what caused the patient's initial presentation. there is a question as to whether it was caused by hsv encephalitis due to the pleds on the eeg, although the hsv pcr did return negative. also, there was no evidence of hsv on mri. the patient was, however, started on a course of acyclovir. the patient began to become more alert and awake after he was called out of the icu and went on the floor. he continues daily to be more and more conversant, able to answer simple questions, and follow simple commands. he passed the swallow evaluation well, and on was able to start a regular diet. he seems to be getting closer and closer to his baseline and able to go back to his nursing home. he will go home on a full 21-day course of acyclovir. he was also initially started on depakote. however, during the first couple days of admission his lfts bumped slightly, and his lipitor was also stopped, and since then his lfts have decreased nicely and are now normal except for a slightly elevated alt. there is no history of alcoholism that was known. the patient steadily continues to improve. discharge condition: good. discharge medications: 1. miconazole powder 2%, one application t.p. q.i.d. p.r.n. 2. famotidine 20 mg p.o. b.i.d. 3. tegretol 200 mg q. a.m., 400 mg at noon, and 200 mg q. p.m. 4. heparin subq. q. 12 hours. 5. keppra 1000 mg p.o. b.i.d. 6. atenolol 37.5 mg p.o. q.d. 7. levofloxacin 500 mg p.o. q.d. 8. albuterol nebulizer q. six hours p.r.n. 9. acyclovir 350 mg intravenous q. eight hours to complete a 21-day course. 10. florinef 0.1 mg p.o. three times per week. 11. lisinopril 5 mg p.o. q.d. 12. tylenol p.r.n. 13. insulin sliding scale. 14. aspirin 325 mg p.o. q.d. discharge instructions: the patient's follow-up appointment is to be scheduled. if any further addendum to the discharge summary will be dictated by dr. . , m.d. dictated by: medquist36 procedure: spinal tap incision of lung diagnoses: thrombocytopenia, unspecified polymyalgia rheumatica urinary tract infection, site not specified candidiasis of mouth pneumonitis due to inhalation of food or vomitus old myocardial infarction grand mal status herpetic meningoencephalitis giant cell arteritis 

Answer: The patient is high likely exposed to