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The diversity of bacteria is astonishing. In fact, it is believed that the biodiversity of organisms known today, it is only a small percentage of the totality of microorganisms that have not been discovered yet. However, the diversity known today, can be divided into two main groups” 1. Beneficial bacteria. 2. Pathogenic bacterias.

MICROBIOTA

Human beings are the habitat of a wide variety of microorganisms named native microbiota. These microorganisms are not only harmless to the host, but they also protect them against pathogenic bacteria, fungi, and viruses that compete for the same available space and nutrients. Microbiota composition depends on different factors, among which we can highlight the following:

• Personal hygiene • Diet • Hydration level • Drugs use (especially antibiotics) • Exposure to environmental toxins.

The digestive tract is an example of the importance of the microbiota because, without it, it would be impossible to have a healthy digestive system, due to its contribution to metabolize bile acids and to synthesize vitamins.