by 
The Curious Bag
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<h4 class="dechead">On One Hand: They're Safe
There is no history of any especially tragic virus being written that will attack Apple (Mac) computers. In fact there are only a couple hundred known viruses that have been uncovered in the OS X operating system and they have not been known to cause any major damage.
On the Other: There is Always a Chance
Although the chances that a Mac computer will be inundated with a virus at this point in time are slim to none, the more popular the OS X operating system gets, the more chances of getting a virus will become apparent.
Bottom Line
Although it isn't considered necessary to arm a Mac computer with a virus scanner, there is always a chance of infection. Installing protection is the only way to make sure that the computer is protected at all times from any kind of malicious software.
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