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What is a virus? In these times of pandemic, we hear a lot about “viruses,” but what exactly is a virus and why does it affect us? According to biology, a virus is a microscopic agent that can only multiply (replicate) inside the cells of an organism using its own genetic material and taking advantage of the cell's replication mechanisms. In other words, viruses need to infect a living cell to control it, causing the cell to reproduce a large number of viruses using its own biological material and machinery. Viruses are much smaller than cells and bacteria, and therefore...