It may or may not surprise you, but there are no OS X viruses (or worms or trojans), partly due to the implementation of OS X and its almost-inaccessible Root. Dr. Smoke, who gave me some advice on this subject, gives a clear explanation of how the problem should be viewed at the X Lab pages at www.thexlab.com/faqs/malspyware.html.
Link: MacNewsWorld.com
