Before starting to read this article, could you please take a minute to depict a bacterium? Oily capsule? Long and zigzagged flagella? Wired and irregular shape? Yes, indeed, ever since its appearance being observed under the microscope, bacteria have been assimilated as a foe that humans need to combat. But did you know that most bacteria in the world are actually friendly and beneficial to humans? It seems that humans and bacteria have reached a harmonious relationship as bacteria could exist everywhere in the human body: in the gut, on the skin and in the mouth. It sounds disgusting, doesn’t

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