What is a virus? How do they spread? How do they make us sick?

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Viruses are the most common biological entities on Earth. Experts estimate there are around 10,000,000,000,000,000,000,000,000,000,000 of them, and if they were all lined up they would stretch from one side of the galaxy to the other.
You can think of them … [+4893 chars]Source

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