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.


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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