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An
Infinity
of
Viruses
What is Virus?
A virus is a submicroscopic infectious agent that replicates only inside the living cells of an
organism. Viruses can infect all types of life forms, from animals and plants to
microorganisms, including bacteria and archaea.
How viruses spread,
and do they make us
sick?
Viruses are the most common
biological entities on Earth. Experts
estimate there are around 10²³ of
them, and if they were all lined up
they would stretch from one side
of the galaxy to the other.
You can think of them as nature's
own nanotechnology, molecular
machines with sizes on the
nanometer scale, equipped to invade
on the cell of other organisms and
hijack them to reproduce themselves.
While the great majority are harmless
to humans, some can make you sick
and some can even be deadly.