This, of course, is coming from a company that makes a living creating ANTI-VIRUS software!!! Pleeeaase!!
Now, I am not saying that OSX in impenetrable. It is not. EVERY OS can be made vulnerable with the right commitment to malice. But, c'mon, guys... they're really reaching now. What they do not tell you is that nothing, NOTHING can be installed into OSX without the user's knowledge. Virus writers know this, and -- given the path of less obstruction -- write viruses for Windows... because it is easy to implant them.
Again, I am not saying that it is untrue... but, consider the source.
Juan