There are currently no viruses in the wild for Mac OS X. None. Note that I said currently. Six years and counting.
However, if you want to prevent yourself from forwarding Windows viruses that you receive by email from other Windows using peopel, you can get the FREE ClamXav AV software for OS X. Just Google for it.
BTW, this conversation usually ends up with a whole bunch of people claiming the opposite. ![]()
P
I have a new MacBook and am wondering if I should invest in anti-virus software. I don't have XP but I do have Office for Mac. The reason I'm asking is that I have just brought back a virus from school and contaminated my old PC.

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