People have discovered and studied around 5,000 viruses, though there are probably millions more buried under the earth crust, at the bottom of the sea or even around us that we either can’t get to or can’t grow to study!
Too many! Luckily we have awesome doctors and scientists looking for cures to different diseases every day. Viruses work by hijacking the cells of other organisms and injecting what they are made of inside them. Then they take the cell over, and breed more and more new virus cells. It’s pretty mean. They aren’t very organised and have hard shells.
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