There are not many anti-virus programs for Linux because they are not necessary and most that do exist are for cleaning files that were infected via samba shares from Windows machines. If you want to be sure your machine is secure from attack (hackers or viruses) be sure to only enable services you need (/usr/bin/setup), learn how to properly use /sbin/iptables, and /usr/bin/up2date.
I've been an AIX, Linux, and Solaris admin for a number of years and an anti-virus application for these systems is almost unherd of.
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