(24) TGEV spherical <20 12.5 μg/mL direct interaction with TGEV surface protein, such as TGEV S glycoprotein (18) linear 60000–80000 linear 20000–30000 Alternatively, nanosilver can be combined with viral nucleic acids to change the capsid structure, affect the replication of viral genetic material, and make the virus inactiv