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: 61-year-old man with little past medical history. lethargy x1 week. falls and falling asleep easily with red blood cells in the cerebrospinal fluid. evaluate for subarachnoid hemorrhage, aneurysm, or encephalitis. technique: multiplanar t1- and t2-weighted pre- and post-gadolinium enhanced brain imaging was obtained. comparison studies on pacs archive: ct angiography of the head from . findings: there is extensive high t2 signal within the white matter of both cerebral hemispheres, and to a lesser extent within the lentiform nuclei, but to a moderate extent within the pons. none of these areas exhibit diffusion or susceptibility abnormalities, nor pathological contrast enhancement. while nonspecific in etiology, given patient age, chronic small vessel infarction is the most likely diagnosis. there is no hydrocephalus or shift of normally midline structures. the principal vascular flow patterns are identified. there is prominent bilateral ethmoid sinus mucosal thickening, with possible fluid levels and/or mucosal thickening, moderate in extent within the sphenoid sinus, with moderate bilateral ethmoid sinus mucosal thickening also observed. the sinus mucosal thickening likely indicates an ongoing inflammatory process, with the air-fluid levels raising the possibility of a more acute component. conclusion: findings most consistent with chronic small vessel infarction, without characteristic signal pattern suggestive of herpes encephalitis. nevertheless, if this diagnosis is suspected clinically, presumably, the patient is already receiving prophylactic acyclovir. addendum and comment: there is mild high t2 signal within the mastoid sinus complexes as well, likely indicating an ongoing inflammatory process as well. finally, regarding the exclusion of acute subarachnoid hemorrhage, a ct scan (over) 11:43 am mr head w & w/o contrast clip # reason: eval for ?subarachnoid or aneurysm, encephalitis (hsv) admitting diagnosis: hypercarbia;pneumonia contrast: magnevist amt: 20 ______________________________________________________________________________ final report (cont) is far more effective than an mri in addressing this issue. in that regard, a ct scan was performed yesterday and did not appear to disclose subarachnoid blood at that time. also, a ct angiogram, obtained yesterday as well, is quite useful in the exclusion of an aneurysm involving the circle of and major vascular tributaries. procedure: venous catheterization, not elsewhere classified continuous invasive mechanical ventilation for 96 consecutive hours or more spinal tap incision of lung other bronchoscopy other lavage of bronchus and trachea arterial catheterization insertion of other (naso-)gastric tube diagnoses: pneumonia, organism unspecified acidosis obstructive sleep apnea (adult)(pediatric) subendocardial infarction, initial episode of care pure hypercholesterolemia tobacco use disorder chronic airway obstruction, not elsewhere classified candidiasis of mouth acute respiratory failure osteoporosis, unspecified inhalation and ingestion of other object causing obstruction of respiratory tract or suffocation polycythemia vera foreign body in other specified parts bronchus and lung 

Answer: The patient is high likely exposed to