I ain't no fan boy and I won't buy a Mac, but if you read the source article it's titled the SHORT history of Mac Malware for a reason. There are hardly 2 dozen incidents EVER.
Mac's can be affected by Malware and Trojans but Mac's do not propagate viruses the way Windows does and that's thanks to the design of the O/S and security, not because nobody's tried. I don't mean they can't get viruses at all, I mean viruses can't propagate the same way they can with all the Windows vulnerabilities. There needs to be user intervention at some point (such as OSX/Leap-A).