Indeed, there are a million threads on this issue. There are only two reasons to run anti-virus software on OS, one is if your IT department requires it, which is sort of dumb but you can't fight it. The other is to be a good neighbor for your exposed PC friends. An infected file can be sent to a Mac from an infectedPC. Then the file could be sent on to another defenseless PC. But even then, the burden should be on the PC user. ClamX fits either scenario, but again, it really isn't necessary.

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Sherman Homan

So, what you are actually saying is that there IS something to worry about? Sorry...could not help picking on you for the double negative...I hope you will forgive me. If I re-engage my serious mode (kind of), which is tough sometimes, I will note that I am one of those "crazy" people that choose to run anti-virus on my Macs. In the end, it is a personal choice. As pointed out, at this point in time, there is little to no threat. Thus, it is perfectly reasonable to not use any anti-virus on your Mac (the BIG exception is if you are actually running Windoze in some form on your Mac...either Bootcamp or Parallels/Fusion...you should DEFINITELY be running anti-virus on the Windoze side of things, even if you choose not to run anti-virus on the Mac OS side of things). I don't berudge anyone that. I just personally feel a little better running anti-virus on my Mac, even if it is really not needed at this point in time.

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Member of the "Crazy Mac Users who run Anti-virus on their Macs" club - come join us and you too can be snickered at!