There are microbes that are living in human body and create a symbiotic relationship which means two living things live together and it is always beneficial rather than harmful.  It is known as normal microbial flora. Understanding about normal microbial flora of human body, their roles and pathogenicity is very important to create healthy precautions to avoid any infectious diseases caused by them. In a healthy human body, it is estimated that there are about 10 trillion cells including nerve cells, epithelial cells, muscle cells and etc. and the number of normal microbial flora ...
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...become tropism and grow in different parts of the body. Their roles are very important in maintaining a healthy body as they are secreting some nutrients and antibody that cannot be produced by human on its own such as vitamin K and vitamin B12. In addition, their roles are recognized as human is producing cultured of living bacteria drink such as Yakult and Vitagen. The drinks are good for the stomach as they have good bacteria. Next is we should be aware of the pathogenicity of normal microbial flora as they can be virulent at anytime and cause infectious diseases. It sounds like they are just waiting for an opportunity to be pathogenic and harming the host. Although they give us some benefits, they also can be harmful to us. It is our responsibility to take care of ourselves, and improve the hygiene so that the normal flora will stay as our beneficial companions.
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