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  1. Virus | Definition, Structure, & Facts | Britannica

    WebApr 12, 2024 · Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. Viruses possess unique infective properties and thus often cause disease in host …

  2. SARS-CoV-2 - Wikipedia

  3. COVID-19 pandemic - Wikipedia

    WebIn epidemiology, a pandemic is defined as "an epidemic occurring over a very wide area, crossing international boundaries, and usually affecting a large number of people". During the COVID-19 pandemic, as with other …

  4. vi·rus
    noun
    1. an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host:
      "the hepatitis B virus" · "a virus infection"
    More about virus
  5. Viruses - National Geographic Society

  6. Coronavirus - Wikipedia