• A virus is a sub-microscopic particle that can infect living cells.
  • Because viruses do not consist of cells, they also lack cell membranes, cytoplasm, ribosomes, and other cell organelles.
  • Viruses can replicate only by infecting a host cell.
  • They cannot reproduce on their own.
  • Antibiotics have no effect on viruses and only a few antiviral drugs are available for some diseases.
  • One of the best ways to prevent viral diseases is with a vaccine, which produces immunity.
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