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 an 86-year-old male with previous history of coronary artery disease, status post coronary artery bypass graft and hypertension who has had progressive decline and cognitive function over the past year. his family had noticed that he had developed progressive short-term memory loss, for example, he would forget where his bedroom was located and head to the garage. he would confuse his nieces and about six months ago, he would forget whether he took his medications and what day it was. around this time, he stopped taking his daily walks and became more withdrawn. his nephew describes an event where he walked off away from home, came back 20 minutes later, stating that he went to the doctor's office, but he did not have an appointment that day and the office was to far away to access by foot. in , he would wake up in the middle of the night and think people were in the house, however at that time he was still mowing the lawn and his primary care physician reports that he had 28 out of 30 on his mini mental status exam at that time. by , the patient had had several violent episodes involving his sister with whom he lived and at that point, she said that she could no longer take care of him and placed him into a psychiatric facility. there, he was disoriented and wanted to leave and at one point struggled with the house staff. he was sent to at that time where he was given ativan. at one point, patient became violent with the staff and began hitting people at which point he was sedated and transfused to the for neuropsychiatric evaluation. he was then transferred to for unclear reasons, but at some point, he was unresponsive and hypotensive, either at or at . he was then transferred to . at , he was lethargic, dehydrated and hypotensive and had coma scale of 4. on arrival to emergency department, patient was given narcan without effect and was intubated for airway protection. ct of the head at the time was negative. the electrocardiogram was unremarkable and urine serum toxicology screen was negative. past medical history: 1. coronary artery disease, status post coronary artery bypass graft. 2. hypertension. 3. dementia. 4. paranoia. allergies: no known drug allergies. medications on admission: cardura, ecotrin, zyprexa 7.5 mg q.h.s., atenolol 25 mg, folate, colace, hytrin and a multivitamin. social history: there is no tobacco or ethanol abuse. at the time of admission, he was a resident of . family history: noncontributory. physical exam on admission: temperature was 96.9. pulse was in the 70s. blood pressure 110/palp. respiratory rate 18. he was saturating 100% on nonrebreather mask. after narcan and fluid resuscitation, his vitals were as follows: temperature 96.9. blood pressure 150/70. pulse 80. respiratory rate 18 and saturation 100% while on a ventilator. general appearance was unresponsive male who is intubated. head, eyes, ears, nose and throat: normocephalic, atraumatic. pupils myotic, unresponsive. mucous membranes moist. neck was supple, soft and there was no jugular venous distention. heart was regular rate and rhythm, normal s1, s2, no murmurs, rubs or gallops. lungs were clear to auscultation bilaterally and the midline sternotomy scar was appreciated. abdomen was soft, nontender, nondistended, positive bowel sounds. extremities were cool. no cyanosis, clubbing or edema. neurological exam revealed him unresponsive to verbal tactile or painful stimuli, bilateral babinski, was indeterminate. there was no gag reflex. corneal reflexes were present. there was a question of decerebrate posturing. laboratories: white blood cell count of 8.0, hematocrit 38.9, platelet count 122,000. sodium 142, potassium 3.3, chloride 118, bicarbonate 21, bun 14, creatinine 1.1, glucose 131. amylase 150, pt, ptt and inr was 13.9 pt, ptt 23, inr 1.3. urinalysis showed 0-2 white blood cells. urine tox screen negative. serum tox screen negative. chest x-ray showed deep sulcus sign on the left. hospital course: patient went thorough negative work-up which included a negative head ct times two; normal electrocardiogram. he ruled out for myocardial infarction by serial enzymes. his b12, folate and tsh were all within normal limits. his b12 was in the low ranges of normal, so he received b12 injections for one week. his urine serum toxicology was negative. adrenal function was within normal limits. his lfts were all normal. there was no infection found except for staph aureus that grew from sputum. his lumbar puncture showed no remarkable findings including an hsv that was negative. he received an abdominal ct during the hospital course which showed no intraabdominal process. patient was extubated on hospital day four and the extubation was successful and he was transferred to the floor. at that time, he spiked temperatures up to 102 degrees fahrenheit and was placed on a course of levofloxacin and vancomycin for suspected pneumonia. vancomycin was soon stopped, but he continued on a ten day course of levofloxacin. patient continued to have waxing and mental status despite discontinuing all medications including cogentin that was started in the medical intensive care unit. on hospital day 14, patient received a physostigmine challenge test to rule out the possibility of anti-cholinergic syndrome and the results of which were equivocal. patient remained confused although was a bit more alert after administration of 2 mg of physostigmine. during the hospital stay, patient received a picc line and was began on tpn on hospital day 12. this dictation will be continued at a later date. , m.d. dictated by: medquist36 procedure: continuous invasive mechanical ventilation for less than 96 consecutive hours venous catheterization, not elsewhere classified parenteral infusion of concentrated nutritional substances insertion of endotracheal tube diagnoses: pneumonia, organism unspecified unspecified essential hypertension aortocoronary bypass status hypotension, unspecified bacteremia disseminated candidiasis alzheimer's disease dementia in conditions classified elsewhere with behavioral disturbance 

Answer: The patient is high likely exposed to