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Viruses are
foreign cells that invade an animal's body. Viruses depend on the animal cells
that they infect to reproduce; they cannot reproduce without a cell.
When a virus
comes into contact with an animal cell, a virus puts its genetic material into
the cell, hijacking its control system. An infected cell produces more
viruses instead of its usual products. When a virus goes into the cell, it
takes over, spills out all its viruses into the host and spreads. The
virus survives, but the host may not.
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