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The size of the virus can be measured by using the following methods:

1. Electron microscopy

2. Ultracentrifugation

3. Hemagglutination assay

4. Filtration through collodion membranes of known pore diameter

5. Counting the number of Plaque-forming units (PFU) in plaque assay

6. Measuring the Infectious Dose (ID50) and Lethal Dose (LD50)