How to handle multiple anti-virus programs?

I recently read that it's advisable (even on a Mac) to have several anti-virus programs running.
Are there any problems likely to occur if one installs more than one anti-virus program? Can both run automatically at the same time?

Aluti, welcome to Apple Discussions.
Look at these links.
The Mac Malware Myth
http://www.roughlydrafted.com/2009/01/29/the-mac-malware-myth/
Should Mac Users Run Antivirus Software?
http://db.tidbits.com/article/9511
Antivirus software is not really necessary on a Mac, however if you receive many emails and forward them to PC users it may help them. I don't use any AV SW on my Macs. If you want to use one to detect a virus on emails, get the freeware antivirus application for Macs - ClamXav @ http://www.clamxav.com/ .
SecureMac has introduced a free Trojan Detection Tool for Mac OS X. It's available here:
http://www.securemac.com/ This site also has a lot of info about Mac security.
 Cheers, Tom

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