Virus size is usually measured by__?

Q. Virus size is usually measured by__?
Answer: nanometers
Notes: Virus size is usually measured by nanometers. Most viruses vary in diameter from 20 nanometers (nm; 0.0000008 in) to 250–400 nm. The largest viruses have a diameter of about 500 nm and a length of about 700–1,000 nm.

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