Some bacteria is good for us if it helps us digest what we eat and if offers us some vitamins or mineral from food while some of the bacteria that enter us is really bad and its multiplication can kill us.
In the video you can find here https://www.youtube.com/watch?v=P19kBUlQxoQ Justin from the Institute of Human Anatomy discusses the incredible ecosystem of microbes that live within the human body — the microbiome.
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