Patient description: The patient is a 60-year-old woman admitted to the stroke department with a recent history of a second course of intravenous antibiotics for aspiration pneumonia. She is febrile and complained of abdominal pain and diarrhea (bowel movements eight times in 3 hours, large volumes of greenish, liquid stool each time). The patient's abdomen is generally tender and distend with hyperactive bowel sounds. She is febrile (38.4°C), tachycardic (113/min) and hypotensive (80/40 mmHg). The stool samples must were positive for Clostridium difficile toxin.

Clinical trial eligibility criteria: eligible ages (years): 18.0-75.0,  Acute Pancreatitis Chronic Pancreatitis ALL All participants must sign an informed consent indicating that they are aware of the investigational nature of this study and willing to undergo study interventions, and authorizing the use of their protected health information for research purposes ALL Meet one set of group-specific listed below ALL All participants must be >= 18 years old and =< 75 years at the time of enrollment NO No personal history or symptoms of pancreatic disease NO No upper abdominal symptoms NO No family history of pancreatic disorders, celiac disease, cystic fibrosis NO No history of acute infectious or inflammatory conditions requiring medical treatment or evaluation in the preceding 6 months (per provider clinical judgment) NO No history of cancer, except for non-melanoma skin cancers NO No known pregnancy at the time of enrollment NO No solid organ transplant or history of human immunodeficiency virus/acquired immunodeficiency syndrome (HIV/AIDS)  ALL NO History of autoimmune or traumatic pancreatitis, or sentinel attack of acute necrotizing pancreatitis which results in suspected disconnected duct syndrome ALL NO Primary pancreatic tumors pancreatic ductal adenocarcinoma, suspected cystic neoplasm (> 1 cms in size or main duct involvement), neuroendocrine tumors, and other uncommon tumors ALL NO Pancreatic metastasis from other malignancies ALL NO History of solid organ transplant, HIV/AIDS ALL NO Known isolated pancreatic exocrine insufficiency (e.g. in the absence of any eligible criteria) ALL NO Participants must not have medical or psychiatric illnesses or ongoing substance abuse that in the investigator's opinion would compromise their ability to tolerate study interventions or participate in longitudinal follow up ALL NO Patients with known abnormal creatinine (glomerular filtration rate [GFR] < 30) or renal failure (applies to patients with chronic upper abdominal pain of suspected pancreatic origin and suspected CP [yellow] subgroups) ALL NO Failure to agree for longitudinal follow-up ALL NO Known pregnancy. All participants of childbearing potential, except if post-menopausal [i.e. no menses for >= 2 years] or had a hysterectomy, bilateral tubal ligation/clip (surgical sterilization) or surgical removal of both the ovaries), must have a negative urine or serum human chorionic gonadotropin (B-HCG) pregnancy test documented within 2 days prior to any endoscopic or radiologic procedures done for research purposes. Any standard of care tests will follow institutional policies regarding pregnancy test