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Created page with "== Introduction == 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. The study of viruses is known as virology, a specialty within the field of microbiology. == Structure == Viruses are composed of a core of genetic material, either DNA or RNA, surrounded by a protective coat called a cap..."
