Have been using Macs since 1984, never had a virus or securiry problem...
What's a virus again?
Fix for Windows and Mac, but Mac fix still has problems.
http://isc.sans.org/diary.php?compare=1&storyid=1993
Generally speaking, pc people who use only a few reputable programs and don't download, never have virus problems either. The last virus I had on one of my pcs was about 10 years ago, and I got it from some software given to me for work.