Linux needs virus scanners like a fish needs a bicycle.
This idiocy of using virus scanners on linux has to stop. All you're doing by using them is legitimizing this scam that is being perpetuated by antivirus companies, who are trying to push a flawed solution to a non-existent problem (on linux). Antivirus doesn't really even work that well at catching malware - even on windows. It is a fundamentally flawed approach, because it's a reactionary approach - the antivirus companies are constantly reacting to individual malware authors and having to update their databases in order to catch all the new malware - which means that the antivirus software will always be one step behind the virus authors. It will never provide security against newest exploits.
Not only that, but antivirus software is also notoriously inaccurate. They give more false positives than they do real ones. But the antivirus companies don't even want to fix this, because the layman isn't going to be able to tell a false positive from a real one, so giving false positives makes their software look more useful. Some small software authors have suffered harassment from clueless users when some crappy antivirus has flagged their software as malware, and the av companies refuse to fix it even when it's reported to them. They don't care as long as it isn't a big software house that can sue their pants off...
If there are new exploits, antivirus won't protect against them anyway, and old exploits tend to be already patched against in the kernel/other software.