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Viruses can vary pretty widely in size depending on the specific type of virus. All are sub-microscopic, and the only way to see them is with an electron microscope since they are measured in nanometers. Influenza viruses vary in size from 10 to 300 nanometers. The nanometer is equal to one billionth of a meter, or one millionth of a millimeter.

See the related question below for more about the size and shape of the Swine Flu virus for an example.

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11y ago
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13y ago

Roughly 120 nanometres

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11y ago

100-120nm in diameter

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