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Bacteria are necessary for human survival.

1) There are bacteria in the digestive system that assist us in breaking down our food, as we cannot break down all types of food with the enzymes made by our own cells. Bacteria produce these other necessary enzymes that are then used by our body to digest food.

2) Some types of bacteria help defend our body from infection. The surface of our skin is covered in helpful bacteria that keep our skin healthy. In the vagina, bacteria keep the pH regular and defend it against the candida fungus that causes thrush. (This is the reason why many women get thrush after going on antibiotics, as all the bacteria is killed off)

3) Bacteria also assist our body against the attack of viruses. In simple terms they could be described to 'distract' viruses from our own body cells. Viruses use cells to multiply by inserting their DNA or RNA into the cell and "tricking" it into making more copies of virus, which it will continue to do so until the cell bursts. So you can imagine that might not be so good if the bacteria in our bodies weren't taking some (at least half) of those attacks.

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11y ago

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