Intestinal flora is symbiotic with the human body and regulated by the external environment and the intestinal internal environment.Changes in the external or intestinal conditions might change the species,abundance,proportion,location and biological characteristics of ...MORE Intestinal flora is symbiotic with the human body and regulated by the external environment and the intestinal internal environment.Changes in the external or intestinal conditions might change the species,abundance,proportion,location and biological characteristics of the intestinal flora,and lead to intestinal flora im...