A member asked:

What is the definition or description of: virus?

3 doctors weighed in across 2 answers

Microorganism: A microorganism that is smaller than a bacterium that cannot grow or reproduce apart from a living cell.

Answered 12/9/2012

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Dr. Dominic Riganotti answered

Specializes in Infectious Disease

Virus: A virus is a small infectious agent that can replicate only inside the living cells of an organism. Viruses can infect all types of organisms, from animals and plants to bacteria and archaea.

Answered 4/26/2013

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