Polio Virus (IMAGE) University of Leeds Caption This is the structure of polio virus as determined by X-ray crystallography -- in case it’s of use. The virus particle is 30 nm in diameter (one thirty millionth of a centimeter). Credit James Hogle, Harvard University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.