INTESTINAL FLORA AND HUMAN HEALTH

The human intestinal tract is filled with a large number of microorganisms, including bacteria, viruses, molds, protozoa, and parasites. Intestinal bacteria are divided into long-term (permanent resident) and transit (foreign) bacteria according to the time of residence and growth in the intestinal tract. Passenger bacteria remain for a few days and are then expelled. Symbiotic bacteria in the intestinal tract can coexist peacefully with the host human body, symbiotically and mutually beneficially, forming what is called the "human super organism". The fermentation of good bacteria is beneficial for the human body. The destructive effects of bad bacteria make people sick. Intestinal bacteria for humans can be divided into good bacteria (beneficial bacteria, symbiotic bacteria), which make up 10-20%. Bad bacteria (bad bacteria, pathogenic bacteria) accounted for 20%, and neutral bacteria (opportunistic bacteria, conditional pathogens) accounted for 60 to 70%.