Who uses Antivirus software on your linux servers?

So who uses antivirus software on your linux servers? A co-worker and myself have been debating on the need or lack there of for antivirus on a linux webserver running Apache even if that's the only service that may be running. He thinks no and I am of the opinion that it is needed. My rational is that even though we may monitor the server that things can slip by and if someone is to crack our box they could add some sort of worm or whatever and by having a product scanning it may help use if we have a problem. So what is everybodies opinion and what do you use on your servers?

This has been discussed in the forums. Keyword search would yield prior discussions.

Bottom line: most people do not use antiviral software on linux... linux OS is different than Windows, where antiviral software is required.

Filtering email based virus is a different subject and applies to all mail servers that receive and queue mail regardless of OS.