The useful idea
- The useful idea
A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism.
- How it works
Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea.
- Why it matters
Viruses are found in almost every ecosystem on Earth and are the most numerous type of biological entity.
Why this matters
Use Virus to ask clearer questions; personal health decisions still belong with a qualified professional.
Try this
Use Virus to ask clearer questions; personal health decisions still belong with a qualified professional.
Test your recall
Which idea belongs to the explanation of Virus?
- Why it matters
- How it works
- The useful idea — correct
A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism.
General education only — not medical advice, diagnosis, or treatment.