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: macrodantin / penicillins / sulfonamides attending: chief complaint: black stools x 2 weeks major surgical or invasive procedure: colonoscopy esopho-gastro-duodenoscopy history of present illness: 82 yo female with hx of htn, chronic afib, s/p repair of asd and h/o mitral and tricuspid value annuloplasty presents with 2 weeks black tarry stools. no brbpr/hemetemesis. pt reports previous gi bleed one year ago with unknown etiology ( nl egd and nl colonoscopy). pt has had sx over the past 2 weeks - increased doe, dizziness. denies chest pain and abdominal pain. pt denies nsaid use. pt is on coumadin for a.fib. in er, hct on arrival was 21.2 and dropped to 17.7 without transfusion and with minimal ivf. pt underwent egd in er which did not show any source of bleed. she was sent for tagged rbc scan which showed bleeding in mid-ascending colon. pt was transfused 1 u prbc while waiting. pt also recieved vancomycin and gentamycin - post egd abx, vit k to reverse coumadin, and iv protonix. pt was admitted to micu for further workup and care. pt was transfused a total of 4 units in the micu and had serial hcts the final being 29.5 today. pt has colonoscopy which was negative for bleed. pt has had bm without signs of bleeding. pt feels fine today. no n/v/sob/chest pain/dizziness. past medical history: 1) htn 2) hypothyroidism 3) afib 4) asd repair 5) gallstones 6) h/o gib social history: no tobacco, no etoh, no ivdu. lives in . has three children. freelance photographer. married twice. hcp: ( nephew) ( h) physical exam: o: vs 98 164/58 65 18 99 % ra gen - lying in bed, nad, pleasant heent - perrla, eomi, moist mucus membranes cv - irreg, irreg, no murmurs lungs - cta b abd - soft, ndnt, + bs ext - no c/c/e pertinent results: 09:30am wbc-5.5 rbc-2.18*# hgb-6.3*# hct-20.7*# mcv-95 mch-28.9# mchc-30.5* rdw-14.3 09:30am plt count-231 09:30am %hba1c-4.7 09:30am potassium-4.0 09:30am glucose-129* 11:15am pt-19.9* ptt-32.4 inr(pt)-2.6 11:15am plt count-229 11:15am hypochrom-2+ anisocyt-normal poikilocy-normal macrocyt-occasional microcyt-occasional polychrom-normal spherocyt-occasional 11:15am neuts-84* bands-0 lymphs-10* monos-5 eos-0 basos-1 atyps-0 metas-0 myelos-0 11:15am wbc-4.5 rbc-2.20* hgb-6.5* hct-21.2* mcv-96 mch-29.6 mchc-30.8* rdw-14.5 11:15am calcium-8.9 phosphate-3.2 magnesium-2.1 11:15am ck-mb-notdone 11:15am ctropnt-<0.01 11:15am ck(cpk)-74 11:15am glucose-109* urea n-27* creat-0.9 sodium-140 potassium-4.3 chloride-107 total co2-24 anion gap-13 05:20pm hct-17.7* brief hospital course: a/p: 82 yo female with pmh of htn, hypothroid, a-fib, gib, here with gi bleed hct drop to 17.7. source was unclear ??avms. 1) gi - pt with no bleeds since micu. hct - 31.6 and so was discahrged home. 2) a. fib - did well. with no acute issues. we restarted coumadin . 3) hypothyroid - continued on synthroid 125 mcg qd. 4) proph - pantaprozole 40 mg po q24. medications on admission: 1. levothyroxine sodium 125 mcg tablet sig: one (1) tablet po qd (once a day). 2. enalapril maleate 10 mg tablet sig: two (2) tablet po qd (once a day). 3. warfarin sodium 1 mg tablet sig: 0.5 tablet po qd (once a day discharge medications: 1. levothyroxine sodium 125 mcg tablet sig: one (1) tablet po qd (once a day). 2. enalapril maleate 10 mg tablet sig: two (2) tablet po qd (once a day). 3. warfarin sodium 1 mg tablet sig: 0.5 tablet po qd (once a day). discharge disposition: home discharge diagnosis: gastrointestinal bleed discharge condition: good discharge instructions: contact physician if you experience further blood in stools, dark stools, fever > 100.5, shortness of breath/chest pain or dizziness. followup instructions: follow up with your primary care provider 2 weeks - call for appt. procedure: colonoscopy esophagogastroduodenoscopy [egd] with closed biopsy transfusion of packed cells gastrointestinal scan and radioisotope function study diagnoses: pure hypercholesterolemia acute posthemorrhagic anemia atrial fibrillation long-term (current) use of anticoagulants unspecified gastritis and gastroduodenitis, with hemorrhage cardiac pacemaker in situ diverticulosis of colon with hemorrhage internal hemorrhoids without mention of complication encounter for therapeutic drug monitoring 

Answer: The patient is high likely exposed to