There a couple of virus scanners available for linux, and I do recommend you atleast research the issue.
I've been using ClamAV http://www.clamav.net/
which is free *setup on my mail server, but It can act as a system scanner as well.
It so far has worked pretty much flawlessly.
Do I recommend you spend 100+ on a linux scanner? no
Do I recommend you look into getting something ? yes