Hello,
A Mac is a computer, and even under OS X, a very cool and awesome OS, it is possible to get a virus. Not likely, but possible.
If you are running on Mac OS X as a local administrator, you have a better chance of deeply infecting your machine than if you are a normal user.
Also, the standard rules of needing to backup to avoid loosing materials during a hardware failure also apply.
If you are interested in scanning your computer (I scan mine once a week), check out ClamAV.
Christian
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Posting Virtuoso
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