All forms of life can have their cells invaded by viruses. When viruses take over plant or animal cells, we call this a viral infection. Several human infectious diseases, some of which are chronic diseases, are caused by viral infection. Using full sentences, explain how viruses infect cells and how the infection spreads to other cells in an organism.

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Virus

Viruses are infectious microscopic agents that can only reproduce in live cells of animals, plants, or microbes and are smaller than bacteria. Vertebrates, invertebrates, plants, protists, and fungi are among their many hosts. Viruses are unable to multiply on their own due to the lack of necessary cellular machinery, but they can guide the cell machinery of a host to make additional viruses by infection. The virus enters and attaches to a particular host cell, injects its genetic material, and reproduces by using the host’s genetic material. Viruses cause infection by taking entry into the host cell and using the host cell’s enzymes and raw materials to multiply.