Is it viruses, virii or what?
The Latin root of virus has no plural form. Since the use of the word virus is borrowed from biology, you might like to conform to the usage normally favoured by biologists, doctors etc., which is viruses. However, a number of people favour the terms virii/viri, either to avoid confusion with the biological phenomenon (but what’s the point of distinguishing in the plural but not in the singular?), or to avoid being mistaken for anti-virus researchers…..
