"A surprising number of governments are now deploying their own custom malware and the end result could be chaos for the rest of us, F-Secure's malware chief Mikko Hypponen told the TrustyCon ( https://www.trustycon.org/ ) conference in San Francisco on Thursday.
'Governments writing viruses: today we sort of take that for granted but 10 years ago that would have been science fiction,' he told the public conference. 'If someone had come to me ten years ago and told me that by 2014 it will be commonplace for democratic Western governments to write viruses and actively deploy them against other governments, even friendly governments, I would have thought it was a movie plot. But that's exactly where we are today.'
http://www.scmagazine.com/trustycon-malware-expert -mikko-hypponen-kicks-off-conference-on-trust/arti cle/336089/"
The proper plural of virus is viruses. If it were a Latin word, as in words like radius -> radii, 'virii' would rather be the second declension masculine plural of the non-existent word 'virius'. There is no attested classical Latin plural form for 'virus' (meaning 'poison' or 'venom'), as it was considered a mass noun, and even if there were one, it would most likely have been considered a second declension neuter noun, whose nominative plural would rather be 'vira'.
Erasmus, is that you?
The -idae suffix does not form a Latin plural, but is a formation from Greek (from εἶδος) that means 'in the form of', and is used in taxonomy to denote subclasses and families.
blah blah blah ...
it would most likely have been considered a second declension neuter noun, blah blah blah 'vira'.
'Vira' it is, then. Thanks for clarifying that -- I'll be sure to start using it with the security people I know.