Identification of Microbiome and Metabolome of Bronchiectasis in Chinese Population.

Inclusion Criteria: * Written informed consent * Regular bowel movement: every 2 days - 3 times/ day * The diagnose of bronchiectasis should refer to "BTS guideline 2010" Exclusion Criteria: * Diagnosis of ABPA * Pregnancy or lactation * Active smoking or alcohol using within last 6 months * HIV infection * Previous abdominal or rectal surgery * Diagnosis of chronic gastrointestinal disease, heart disease, diabetes, severe renal insufficiency (GFR \< 30ml/min) or immunodeficiency * Regular use of the following types of medications (\> 2 times per week) within last 2 months: opium, loperamide antidiarrheal, systemic antihistaminic, metoclopramide, proton pump inhibitor * Poor compliance or inability to cooperate as judged by the doctor