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: penicillins attending: chief complaint: melena major surgical or invasive procedure: upper endoscopy history of present illness: 31 year old previously healthy male was seen at the office of his pcp today for complaint of melena (black stools), lightheadedness and mild ?coffee ground emesis. patient states he woke up on sunday at 3am and had an episode of dark brown emesis; given that he had just had bbq for dinner, he was unsure of the significance. the following morning, he had a solid black, foul smelling, formed but slightly soft bowel movement. he did not have any abdominal cramping but did have some discomfort, so he started taking pepto bismo. the patient proceeded to have two more episodes of tarry black stools on tuesday morning prior to going to his pcp's office. throughout tuesday, he felt light headed and short of breath with mild chest pressure when exerting himself (ex: walking up stairs to his apartment). labs at his pcp's office showed hemoglobin 7.6 and hematocrit 22.6. patient was advised to come to the er for further work-up and management. of note, patient denies significant alcohol, nsaid, coffee consumption; also denies significant retching with episode of emesis on sunday or significant history of gerd. . in the ed, patient was tachycardic to 110 although abdominal exam was benign; patient was complaining of exertional chest pressure/shortness of breath but cardiac enzymes were negative x1. on rectal exam, no bright red blood or tarry stools were found in the rectal vault but patient was guaiac positive. ng lavage was performed which yielded coffee ground emesis that would not clear after 400cc, no bright red emesis was noted. patient was given 1l intravenous fluid boluses and transfused 2 units of prbc, type and crossed for 4 units. two 18 gauge peripheral ivs were placed and intravenous ppi started. gi was informed of the patient and plans to do egd in the morning unless the patient is still tachycardic. vs upon transfer: were afebrile, heart rate 102, bp126/65, rr20, 100%ra. . upon arrival to the icu, patient was resting comfortably in bed. he denies current light headedness, chest pressure or shortness of breath. . review of systems: (+) per hpi (-) denies fever, chills, night sweats, recent weight loss or gain. denies headache, rhinorrhea or congestion. denies coughor wheezing. denies chest pain, palpitations, or weakness. denies nausea, diarrhea, constipation, abdominal pain. denies dysuria, frequency, or urgency. past medical history: bilateral ankle fractures social history: social history: third year law student at t - denies a - drinks every other weekend d - denies illicit drug use family history: diabetes mellitus, no history of peptic ulcer disease or malignancies . physical exam: vitals: t: afebrile bp: 156/84 p: 109 r: 18 o2: 98% ra general: alert, oriented, no acute distress, well-nourished heent: sclera anicteric, mmm, oropharynx clear neck: supple, jvp not elevated, no lad lungs: clear to auscultation bilaterally, no wheezes, rales, ronchi cv: regular rate and rhythm, normal s1 + s2, no murmurs, rubs, gallops abdomen: soft, non-tender, non-distended, bowel sounds present, no rebound tenderness or guarding, no organomegaly gu: no foley ext: warm, well perfused, 2+ pulses, no clubbing, cyanosis or edema pertinent results: admission labs: 10:05pm blood wbc-11.4* rbc-2.21* hgb-6.2* hct-18.5* mcv-84 mch-27.6 mchc-33.0 rdw-15.9* plt ct-235 10:05pm blood neuts-76* bands-0 lymphs-17* monos-7 eos-0 baso-0 atyps-0 metas-0 myelos-0 nrbc-4* 10:05pm blood hypochr-normal anisocy-1+ poiklo-normal macrocy-normal microcy-normal polychr-normal 10:05pm blood pt-13.5* ptt-25.0 inr(pt)-1.2* 10:05pm blood ret man-4.7* 10:05pm blood glucose-109* urean-24* creat-1.0 na-137 k-4.2 cl-105 hco3-26 angap-10 10:05pm blood alt-22 ast-24 ld(ldh)-176 ck(cpk)-92 alkphos-28* totbili-0.2 10:05pm blood ck-mb-notdone ctropnt-<0.01 10:05pm blood lipase-47 10:05pm blood albumin-3.4* -135 10:05pm blood caltibc-289 vitb12-262 folate-13.1 hapto-105 ferritn-98 trf-222 10:24pm blood glucose-108* na-138 k-3.9 cl-104 calhco3-25 11:12pm urine color-straw appear-clear sp -1.019 11:12pm urine blood-neg nitrite-neg protein-neg glucose-neg ketone-neg bilirub-neg urobiln-neg ph-5.0 leuks-neg helicobacter pylori antibody test (final ): positive by eia. (reference range-negative). ecg: sinus tachycardia. slight st-t wave changes are non-specific and may be within normal limits. no previous tracing available for comparison. egd: old hematin was seen in the stomach. there was a very small ulcer noted in her antrum with small clot overlying it. this was likely the source of gi bleeding. there were also several small erosions noted in the antrum as well as gastritis. erythema in the duodenal bulb compatible with duodenitis otherwise normal egd to third part of the duodenum 02:13am blood wbc-6.7 rbc-3.66* hgb-10.4* hct-31.0* mcv-85 mch-28.3 mchc-33.5 rdw-17.8* plt ct-211 02:13am blood glucose-92 urean-12 creat-1.2 na-140 k-4.1 cl-105 hco3-26 angap-13 05:10am blood alt-18 ast-20 alkphos-32* totbili-1.2 02:13am blood calcium-8.9 phos-4.8*# mg-2.2 10:05pm blood caltibc-289 vitb12-262 folate-13.1 hapto-105 ferritn-98 trf-222 10:05pm blood albumin-3.4* -135 09:25am blood ck-mb-notdone ctropnt-<0.01 10:05pm blood ret man-4.7* 09:47am blood hgb a-pending hgb s-pnd hgb c-pnd brief hospital course: # melena - patient presented with melena and hct of 18. he received ivf and blood transfusions support as was admitted to the micu. an emergent egd was performed and this revealed an antral ulcer, as above. the patient denied alcohol or recent nsaid use. adequate type and screen and iv access were maintained. he was also started on iv ppi boluses/gtt. overnight, the patient's hct had decreased to 22.6, and the gi fellow was paged. urgent egd was not felt to be necessary, as the patient's ng lavage was negative for gross hemorrhage. once the patient was stable and hct was also stable he was started on a clear diet and advanced to regular. iv ppi was changed to po after 3 days of therapy. h pylori serology was sent and resulted in a positive test. he was started on clarithromycin and metronidazole (allergic to penicillin) and given a prescription to finish a 2 week course of triple therapy. he received a total of 6 prbc transfusions. . # anemia - the patient had an active gi bleed as above, but it was unclear what his baseline hematocrit is. hemoglobin electropheresis was sent, but these are still pending and should be followed up by his pcp. panel and hemolysis labs were wnl and this was all felt to be secondary to gi bleed. . # substernal chest pressure - believed to be mild demand ischemia in setting of gi bleed. ekg and cardiac enzymes within normal limits. the patient was followed on telemetry. . # leukocytosis - mild, likely demargination in the setting of recent gi bleeding, this resolved after treatement for acute gib. . # code: the patient was full code for the duration of the admission medications on admission: occasional centrum, advil ~1x/week (up to 4 tabs discharge medications: 1. metronidazole 500 mg tablet sig: one (1) tablet po bid (2 times a day) for 13 days. disp:*26 tablet(s)* refills:*0* 2. clarithromycin 250 mg tablet sig: two (2) tablet po q12h (every 12 hours) for 13 days. disp:*52 tablet(s)* refills:*0* 3. pantoprazole 40 mg tablet, delayed release (e.c.) sig: one (1) tablet, delayed release (e.c.) po q12h (every 12 hours). disp:*60 tablet, delayed release (e.c.)(s)* refills:*2* discharge disposition: home discharge diagnosis: upper gi ulcer bleed h. pylori discharge condition: mental status:clear and coherent level of consciousness:alert and interactive activity status:ambulatory - independent discharge instructions: you were admitted because you were having blood in your stool and found to be severe anemia due to blood loss. we transfused a total of 6 units of blood. we did an upper endoscopy and found you had an ulcer that looked like it had recently bled. you were started on medications to decrease the acid in your stomach. you were also found to have a bacteria in you stomach called h. pylori that can cause ulcers. you were started on antibiotics for this and should finish a 2 week course of these. medication changes: start: pantoprazole 40 mg twice a day start: metronidazole 500 mg twice a day for 13 days start: clarithromycing 500 mg twice a day for 13 days followup instructions: appointment #1 md: dr. specialty: internal medicine-primary care date/ time: location: , ma phone number: special instructions for patient: the office will call you with an appointment for your hospitalization. if you do not here from the office in 2 business days please call them. thanks. appointment #2 md: dr. specialty: gastroenterology date/ time: 12:40pm location: , ma phone number: procedure: other endoscopy of small intestine diagnoses: acute posthemorrhagic anemia chronic or unspecified gastric ulcer with hemorrhage, without mention of obstruction hypovolemia chest pain, unspecified tachycardia, unspecified unspecified gastritis and gastroduodenitis, without mention of hemorrhage helicobacter pylori [h. pylori] 

Answer: The patient is high likely exposed to