Viruses are generally considered not to be alive (they must use a host cell of something else to reproduce). However, defining exactly what life is, is not as easy as you might think.
“There’s no doubt, this is a living organism,” the journal Nature is told by Prof Jean-Michel Claverie, director of the Mediterranean Institute of Microbiology in Marseilles, part of France’s basic-research agency CNRS. “The fact that it can get sick makes it more alive.”
Related: People Have More Bacterial Cells than Human Cells - Bacteria Feed on Earth’s Ocean-Bottom Crust - Retroviruses - Bacteriophages: The Most Common Life-Like Form on Earth
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