Microorganism distributes in the organs of human body which connect with external environment, especially those organs in the gastrointestinal tracts, and it also plays a fundamental role in the physiopathology of the host's body. Because the microorganism is very small and has a great variety, it is difficult to reveal the significance of microorganism in the human physiopathology comprehensively and deeply. With the development of molecular biology, genomics, bioinformatics and other disciplines, the microbiome research will be more possible and easier. There are two key contents of microecology. One of these is to identify and quantify the diversity of microorganism, and the other is to reveal activity and the physiopathological function of microorganism in the host. Microbiome research methods, therefore, can be summarized as the traditional detection methods, construction of gene library, the genetic fingerprint analysis and molecular hybridization techniques and so on.
A well-conducted evidence-based guideline not only considers the efficiency and the cost of the recommended intervention, but also the acceptability and feasibility of the intervention during implementation. Systematic reviews of qualitative research aim to provide qualitative evidence such as the acceptability and feasibility of the intervention. In developing evidence-based guidelines, qualitative evidence helps to:(1) Define the scope of guideline; (2) Assess the acceptability of interventions; (3) Assess the feasibility of interventions; (4) Identify considerations when implementing guidelines. Systematic reviews provide the fundamental evidence required to develop robust and trustworthy guidelines. The CERQual (Confidence in the Evidence from Reviews of Qualitative research) approach aims to grade the evidence from systematic reviews of qualitative research. After critically and scientifically appraising by CERQual, the acceptance and feasibility of an intervention are given different grading, which is the critical process of developing evidence-based guidelines. This paper will demonstrate the value of systematic reviews of qualitative research in developing evidence-based guidelines and how to implement recommendations from qualitative evidence.