Viruses, organisms at the edge of life

Viruses, organisms at the edge of life
“A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea [single-cell life forms]. Since Dmitri Ivanovsky’s 1892 article describing a non-bacterial pathogen infecting tobacco plants… more than 6,000 virus species have been…

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