Anti Virus Advice

Hi guys

Been reading a lot on this site lately, and am getting a bit more paranoid (read aware), the more I read.

Recent years I've just gone with the MS Security Essentials on my windows PC, and haven't really thought that much about anti virus on my Mac and Linux box.

Yesterday I spent some time going through antivirus reviews but didn't get much wiser.

Can you guys recommend a good antivirus that preferably works on windows, OS X and Linux.

N.B.. I did search the forum before I posted. I didn't find any good posts about this.