A virus is a germ that when it gets into your body whether it's from air, touch, or food. It has these tiny little points that can only get into certain cells. That might mean you might get a cold but your dog can't. So after it inserts, it tells the cell it tells the brain to reproduce more of the virus. As it reproduces it has a chance to mutate so it can infect different cells. This is how COVID originated from bats but then mutated to be able to affect humans
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