Like before here's some results of running BitDefender, ClamAV and F-prot on over 11K of files containing Rootkits, LKM's and other goodies. Because of what I do most of the files are GNU/Linux related. (I run AV like a pentester would run metasploit against a networked entity.) I'm well aware of the AV-on-GNU/Linux-yes-or-no debate and this is not the place to go into that: search LQ or open up a thread if you need to discuss validity.

The commercial AV market is kind of an odd...

Here's some scan results of running BitDefender, ClamAV, F-prot and NOD32 on a stash of aproximately 10K files containing a mixed set of Root kits, LKM's, tools and w32 goodies:
Files scanned: BDC: 12113, NOD32: 11000, F-prot: 9375, ClamAV: 9280.
Threats / infected + suspected files found: BDC: 537, NOD32: 421, F-prot: 366, ClamAV: 150.

More details here: http://www.linuxquestions.org/questions/showthread.php?t=491870