A virus is a small infectious agent that replicates only inside other organisms. Viruses can infect all types of life forms, from animals to plants and even several bacteria and their derivates.

Reference:

Koonin, Eugene V., Tatiana G. Senkevich, and Valerian V. Dolja. “The ancient Virus World and evolution of cells.” Biol Direct 1.1 (2006): 29.

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