Got that wrong too. Thanks for reminding me.

Quote:
|
Despite frequent claims to the contrary, the only correct English plural of the word used in any of these senses is viruses, not virii. The "ii" is used to denote plurality in Latin words ending in "ius", not "us." Hence it is "viruses", not "virii." If virus was spelled "virius," then the plural "virii" would be correct, however, it is not.
|
From
here.
Cheers
Mick