An echovirus measures 24-30 nanometres (nm), and is similar to other viruses, since it has a naked protein capsid, which makes up 75% of the virus particle that encloses a dense central core of single-stranded RNA.
An echovirus measures 24-30 nanometres (nm). An echovirus is similar to other viruses. It has a naked protein. This naked protein is capsid. A naked protein capsid makes up 75% of the virus particle. This 75% of the virus particle encloses a dense central core of single-stranded RNA.