What do viruses/bacteria exactly do inside of our bodies that makes them dangerous and causes us to get sick?
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You ever see a wasp lay eggs inside of a spider?
It’s kind of like that. Viruses infect human cells, replicate inside of them, and then tear the cell apart. Now you have one less cell in your body and thousands of new virions (an individual virus isn’t a cell itself, it’s a virion). They infect thousands of cells and the process repeats. I’m sure you can see how this can get really serious, really fast.
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