anti virus for mac

None. There is nothing for them to do so all they do is cause trouble.

Allan

See Thomas Reed's Mac Malware guide and scroll down to Do I need anti-virus software?

http://www.reedcorner.net/guides/macvirus/

There is no simple yes or no answer to this question.

You may find this User Tip on Viruses, Trojan Detection and Removal, as well as general Internet Security and Privacy, useful:

https://discussions.apple.com/docs/DOC-2435

The User Tip (which you are welcome to print out and retain for future reference) seeks to offer some guidance on the main security threats and how to avoid them, including the Flashback Trojan.