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: the patient is a 76-year-old female nursing home resident with a history of vascular dementia, paroxysmal atrial fibrillation (on warfarin anticoagulation), congestive heart failure, and hypertension who was found to be more confused than her baseline. on transfer to the , her hematocrit was found to have decreased from 46% to 34%. rectal examination revealed red/maroon stools. nasogastric lavage did not recover blood. the patient was admitted to the medical intensive care unit for treatment of lower gastrointestinal bleeding. past medical history: 1. hypertension. 2. vascular dementia. 3. congestive heart failure; an echocardiogram in showed an ejection fraction of 60% to 70% with 2+ mitral regurgitation. 4. paroxysmal atrial fibrillation (on anticoagulation); of note, her inr was 8 on presentation here. 5. chronic pain. 6. breast cancer. 7. history of gastrointestinal bleeding. allergies: vasotec and novocaine. medications on presentation: 1. fentanyl patch 25 mcg transdermally per hour (change every 72 hours). 2. lisinopril 5 mg p.o. once per day. 3. calcitonin nasal spray. 4. spironolactone 25 mg p.o. once per day. 5. levothyroxine 125 mcg p.o. once per day. 6. zoloft 200 mg p.o. once per day. 7. multivitamin/zinc/vitamin c supplements. 8. urecholine 25 mg p.o. once per day. 9. xanax 0.25 mg p.o. twice per day. 10. atorvastatin 10 mg p.o. once per day. 11. trazodone 1 mg p.o. every evening. 12. olanzapine 5 mg p.o. every evening. 13. calcium carbonate 500 mg p.o. three times daily. 14. aspirin 325 mg p.o. once per day. 15. neurontin 400 mg p.o. twice per day. 16. warfarin 2 mg p.o. once per day. social history: the patient lives in a nursing home. question regarding her medical care should be referred to her daughter (her telephone number is ). pertinent laboratory values on presentation: initial laboratory evaluation revealed white blood cell count was 19, hematocrit was 34, and platelets were 447. inr was 8.2. chemistry panel was normal. serial creatine kinases and troponin levels did not reveal a myocardial infarction. urinalysis revealed the presence of a urinary tract infection. pertinent radiology/imaging: an electrocardiogram was unremarkable. a chest x-ray showed questionable right lower lobe opacity. hospital course: the patient was initially admitted to the medical intensive care unit. anticoagulation was reversed. the patient underwent an esophagogastroduodenoscopy and colonoscopy. the esophagogastroduodenoscopy showed some erosions in the antrum with otherwise normal findings to the second part of the duodenum. the colonoscopy revealed multiple nonbleeding diverticula with small openings in the sigmoid colon. there were large deep oozing ulcers in the rectum and the distal sigmoid colon as well. cold forceps biopsies were performed, and the results were pending at the time of this dictation. the patient's hematocrit remained stable, and she was transferred to the medicine service to continue treatment of what was ultimately identified as a methicillin-resistant staphylococcus aureus pneumonia. methicillin-resistant staphylococcus aureus was isolated from her blood as well as the right femoral vein catheter tip. following clearing of her cultures, she had a percutaneously inserted central catheter placed and shall complete a 10-day course of vancomycin. she remained afebrile. of note, she required increasing doses of fentanyl patch transdermally for pain control. medications on discharge: 1. levothyroxine 125 mcg p.o. once per day. 2. multivitamin one tablet p.o. once per day. 3. calcitonin 200 international units inhaled daily. 4. sertraline 200 mg p.o. once per day. 5. alprazolam 0.125 mg p.o. three times per day. 6. vitamin c 500 mg p.o. twice per day. 7. atorvastatin 10 mg p.o. once per day. 8. calcium carbonate 500 mg p.o. three times per day. 9. tylenol 325 mg to 650 mg p.o. q.4-6h. as needed. 10. propoxyphene one tablet p.o. q.4-6h. as needed. 11. milk of magnesia 30 ml p.o. q.4-6h. as needed. 12. olanzapine 2.5 mg p.o. in the morning and 7.5 mg p.o. in the evening. 13. pantoprazole 40 mg p.o. q.24h. 14. oxycodone 5 mg p.o. q.4-6h. as needed. 15. fentanyl patch 50 mcg per hour transdermally (change every 72 hours). 16. vancomycin 1 g q.12h. (to complete a course ending on ). , m.d. dictated by: medquist36 procedure: venous catheterization, not elsewhere classified venous catheterization, not elsewhere classified other endoscopy of small intestine closed [endoscopic] biopsy of large intestine diagnoses: urinary tract infection, site not specified congestive heart failure, unspecified atrial fibrillation bacteremia blood in stool infection and inflammatory reaction due to other vascular device, implant, and graft diverticulosis of colon (without mention of hemorrhage) other specified gastritis, without mention of hemorrhage ulcer of anus and rectum 

Answer: The patient is high likely exposed to