HT1338: OS X: Updating OS X and Mac App Store appsLearn about OS X: Updating OS X and Mac App Store apps
Currently Being ModeratedMar 27, 2013 2:05 PM (in response to jaspergreer)
You already do. As long as you keep it up to date and don't run Windows on the computer, you don't need anything beyond what Mac OS X provides. Having ClamXav and/or Sophos is helpful if you frequently exchange files with people running Windows.
Currently Being ModeratedMar 27, 2013 8:26 PM (in response to jaspergreer)
how do I check that I have antivirus protection on my mac
Your profile says you are using OS X Mountain Lion, so if that's true then you have all of Apple's anti-virus protection and if Software Update says you are fully up-to-date on all your Security, Java, etc. updates, then you are fully protected against all currently known malware that can impact OS X and Apple apps.