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[Current research progress and thinking of fecal microbiota transplantation for the treatment of gastrointestinal disorders].

Fecal microbiota transplantation (FMT), also known as fecal bacteriotherapy or fecal infusion, consists of injection of a liquid filtrate of feces from a healthy donor into the gastrointestinal tract of a recipient individual. FMT has been proposed as a therapeutic approach for functional diseases of the gastrointestinal tract by reestablishment of a wide diversity of intestinal flora. Clostridium difficile infection (CDI) treatment guideline from American Gastroenterology Association (AGA) recommends that FMT can be used as the treatment protocols of relapse CDI. Numerous case reports, retrospective case series, and randomized controlled trials have shown the benefit of FMT in patients with functional bowel disorders, including inflammatory bowel disease, irritable bowel syndrome and constipation, etc. Evidence regarding the safety of FMT is relatively limited because the very rapid adoption of FMT as a therapeutic modality for CDI occurred before the performance of large, long prospective trials that are typically conducted to assess the safety of new interventions. Potential adverse events can be categorized as short-term and long-term, and short-term events can further be divided into those related to the method of FMT delivery (colonoscopy, sedation) and those related to the FMT itself. Due to the recent emergence of FMT, little data exist regarding long-term events and many safety concerns are speculative. Capsulized FMT therapy solves the clinical problems associated with the use of fresh FMT suspensions for long-term maintenance i.e. repeat transplantation and invasive procedures, which is of great significance to optimize the traditional FMT clinical strategy. Future work will focus on establishing best practices and more robust safety data than exist currently, as well as refining FMT beyond current "whole-stool" transplants to increase safety and tolerability. Encapsulated formulations, full-spectrum stool-based products, and defined microbial consortia are all in the immediate future. Although challenges exist, regulatory agencies have been willing to work with stakeholders and will continue to evolve and adapt policy as therapeutics based on human gut microbiota research emerge.

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