Analysis of Biliary Microbiota in Hepatobiliopancreatic Diseases Compared to Healthy People [MICROBILIO]

Inclusion Criteria: Endoscopic retrograde cholangiopancreatography (ERCP) candidates (case group) * Patients over 18 years old complete * Patients previously scheduled for ERCP * Cannulation of the bile duct, via the transpapillary route, with the aid of a papillotome with an end kept sterile until contact with the papilla Liver transplant living-donor (control group) * Patients over 18 years old up to 55 years * Previously selected patients with scheduled surgery * BMI: 18 kg / m² to 28 kg / m² * Blood typing identical to the recipient * Absence of significant medical, psychiatric problems or previous abdominal surgery * Normal laboratory tests: liver function tests, blood count, coagulogram, pregnancy test and serology for hepatitis B, C and HIV * Normal imaging exams: CT of the abdomen and pelvis with liver volume (remaining volume - 30-40% of the total liver volume), MRI with cholangioresonance Exclusion Criteria: * ERCP candidates (case group) * Use of antibiotics during ERCP or in the last 2 months prior to the procedure * Emergency ERCP * Pregnancy * Uncorrected coagulopathy Liver transplant living-donor (control group) * Use of antibiotics in the last 2 months prior to the procedure * Pregnancy * Uncorrected coagulopathy