How we measure the size of a virus (the methods)? -Biology

How we measure the size of a virus (the methods)? -Biology
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Size of virus particles commonly is determined three ways: (1) Electronmicroscopy (2) Ultrafiltration and (3) Ultracentrifugation. and density gradient ultracentrifugation to determine size of a virus believed to be one cause of Infectious Bovine Keratitis (IBK).
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