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Size of a virus

Viruses are tiny: most are between $$20$$ and $$300\text{ nm}$$ (nanometres) across.

This is about one thousandth the size of a eukaryotic cell, which is typically $$10-100\text{ }\mu\text{m}$$ (micrometres) across.

This virus causes disease in sheep. It is less than 100nm across.
This virus causes disease in sheep. It is less than 100nm across.