One worm would be OSX/Inqtana.A
Thers also the oompa loompa virus
theres Anti.A, Code 1, CDEF, 252, Melissa, AOL4free, oompa being OSX/Leap. A is the most none one. Im not saying your system is crappy and im not starting a Flame war, i just stating Just because your system has never gotten a virus doesnt mean it is comepletly immune to them and none exist. Yes i agree if you own a mac you probably will never get one but they do exist. As for me i stick with PC because it is much easier to upgrade it has nothing to do with viruses or whos the better company.