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: allergies: patient recorded as having no known allergies to drugs attending: chief complaint: pancreatic mass, thrombosis of portal vein. major surgical or invasive procedure: small bowel resection. gastrostomy tube. abdominal washout x4, and eventual closure. percutaneous tracheostomy. history of present illness: 59m initially presented to pcp office with nausea, vomiting, abdominal pain. ct demonstrated cystic mass at tail of pancreas, and thrombosis of portal/smv/splenic veins. he was admitted for bowel rest, hydration and observation. past medical history: rheumatoid arthritis social history: 20 pack year smoker, quit one month prior to admission. occasional etoh. retired, on disability. family history: father: dm, cad, colon ca. mother: melanoma physical exam: no vital signs. no corneal or gag reflex. no breath or heart sounds. no response to painful stimuli. brief hospital course: patient was initially admitted for observation, bowel rest and hydration. he was anticoagulated and placed on parenteral nutrition. a hypercoaguable workup and was unrevealing. his clinical status deteriorated, and he was taken to the operating room for emergent laparotomy -- for details see operative note. his bowel was perforated, and the patient was resected and left with an open abdomen. over the subsequent weeks, he had multiple returns to the operating room with washouts and sequential closure. he developed sepsis, renal failure, ongoing liver failure and had percutaneous trachesotomy performed. ultimately, his multi-organ system failure resulted in the need for broad spectrum antibiotics, mechanical ventilation, tpn, cvvh and vasopressors. after clinical decline, discussion was carried out with the family and attendings and the decision to withdraw care was made. he expired shortly thereafter. medications on admission: 1. prednisone 2. percocet 3. promethazine 4. methotrexate discharge medications: expired. discharge disposition: expired discharge diagnosis: mesenteric ischemia. portal venous thrombosis. perforated bowel. sepsis. renal failure. enterocutaneous fistula. discharge condition: expired. discharge instructions: expired. followup instructions: expired. procedure: parenteral infusion of concentrated nutritional substances other partial resection of small intestine enteral infusion of concentrated nutritional substances hemodialysis venous catheterization for renal dialysis temporary tracheostomy excision or destruction of peritoneal tissue reopening of recent laparotomy site other repair of abdominal wall other repair of abdominal wall small-to-small intestinal anastomosis peritoneal lavage excision or destruction of lesion or tissue of abdominal wall or umbilicus reclosure of postoperative disruption of abdominal wall injection or infusion of oxazolidinone class of antibiotics diagnoses: acute kidney failure with lesion of tubular necrosis severe sepsis perforation of intestine hematoma complicating a procedure defibrination syndrome rheumatoid arthritis anticoagulants causing adverse effects in therapeutic use embolism and thrombosis of other specified artery streptococcal septicemia acute vascular insufficiency of intestine peritoneal abscess chronic vascular insufficiency of intestine vascular disorders of kidney fistula of intestine, excluding rectum and anus peritonitis (acute) generalized unspecified disease of pancreas other diseases of spleen portal vein thrombosis non-healing surgical wound 

Answer: The patient is high likely exposed to