What do viruses/bacteria exactly do inside of our bodies that makes them dangerous and causes us to get sick?
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So, as have already been said, viruses hijack your cells and replicate. The symptoms are your body trying to get rid of it, fever to make the host environment no longer tolerable, mucus and diarrhea to flush it out.
Bacteria are another thing altogether. Bacteria want to eat and grow just like other organisms. Bacteria are already in you and on you. Forming a mostly healthy symbiosis, like the ones in your intestines that help you digest food.
For the most part, bacteria are harmless. However, sometimes there is an imbalance in your body that allows them to grow out of control. Other times you are exposed to bacteria that your body isn’t adapted to. In many cases what kills you are the byproducts of the bacteria, not only are they consuming your cells but they are creating “waste” that are poisoning you.
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