This article is from the Viruses and the Mac FAQ, by David Harley D.Harley@icrf.icnet.uk with numerous contributions by others.
Not all variants are listed here. It was originally intended to
reference all the major variants at least by name eventually, but
since the information is of academic interest at best to most users
(and available elsewhere anyway), it's no longer considered a
priority. The main problem affecting Mac users nowadays is the
spread of macro viruses, and I can't possibly find time to
catalogue them individually, so they are only considered generally.
Native Mac viruses are rather rarely seen nowadays, and most people
don't need to know about them in detail -- in fact, what they need
most is to know that their favoured antivirus software will deal
with them. Note that I'm not primarily in the business of hands-on
virus analysis, and cannot accept responsibility for descriptive errors
based on third-party information. [DH]