上游充通大学 SHANGHAI JIAO TONG UNIVERSITY 9.2 Nature of the Virion Size of virions Ranging from 0.02 to 0.3 um(20-300nm) Smallpox virus天花病毒is about200nmin diameter;poliovirus脊髓灰质炎病毒is only 28nm in diameter (about the size of ribosome). Chen Feng,Shanghai Jiao Tong UniversityChen Feng, Shanghai Jiao Tong University 9.2 Nature of the Virion Ranging from 0.02 to 0.3 m (20-300nm). Smallpox virus天花病毒 is about 200nm in diameter; poliovirus脊髓灰质炎病毒is only 28nm in diameter (about the size of ribosome). Size of virions