Virus

(For a more accessible and less technical introduction to this topic, see Introduction to viruses.) A virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.

Virus

(For a more accessible and less technical introduction to this topic, see Introduction to viruses.) A virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.