File:Polio.jpg

Description: Note that poliovirus particles exhibit a basically featureless appearance in comparison to other small viruses such as astrovirus, Norwalk virus and other SRSVs, and typical (non-SRSV) calicivirus. Bar = 50 nanometers.

Method: Negative-stain Transmission Electron Microscopy on cell culture.

Photo Credit: F.P. Williams, U.S. EPA Source: http://www.epa.gov/microbes/polio.htm

From en.wikipedia pt: poliomielite