Is the Mac immune to viruses

It seems that about once a week someone asks me if they should switch to a Mac computer because they just got hit by some sort of mal-ware (malicious software). The answer is usually the same (and is phrased in the form of a question for you Jeopardy fans), "Do you need a Windows computer to run any of the applications that you use?" If the answer is no, and the price doesn't cause pause, then a Mac may be the computer for you. But don't buy a Mac to avoid mal-ware, at least not anymore. The article at this link points out that due to the increase in the Mac market share criminals are taking aim at that computer line. So if you get a Mac, be vigilant about protecting it.