MAC computer security

[Beeherder]

There is an active piece of malware circulating which attacks MACs.

http://www.zdnet.com/blog/bott/an-applecare-support-rep-talks-mac-malware-is-getting-worse/3342?pg=1

Are there other options for MAC antivirus packages than the three major vendors mentioned in the article; Norton, McAfee, Sophos ??