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When a virus infects a living organism, it injects an infectious agent that can only replicate within the host organism. This infectious agent is called a viral genome which consists of DNA or RNA in RNA viruses. Genomes of viruses , just like any other genomes, contain genes that enable virus to multiply. 

A virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all  from animals and plants to microorganisms, including bacteria and archaea.

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