Poliovirus
Photo Credit: F.P. Williams, U.S. EPA
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.
Source: Cell culture.
Method: Negative-stain Transmission Electron Microscopy
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