As you and others have mentioned, if you practive
"safe computing" you
should not have a problem.
Recent events have shown that the only way to safe computing is to forever
forbid removable media and any kind of network connections. :-)
For a little while, I'm getting 5000 unwelcome messages per day on average,
either trying to infect my systems, or wrongly warn me that I sent viruses,
because my name is being spoofed as the `From' header in messages
originating far from here, and widely broadcasted away from here. Likely,
my name was found on the disks of numerous remote, infected systems.
My various filters clean out about 99.85% of the clutter, still, enough goes
within the cracks to be slightly annoying as a user, and surely annoying
when considering the network bandwidth taken by this overall noise, and for
which we have to pay. (Europeans might be paying more than we do here...)
Most people would say that I practice computing in quite safe ways. :-)
The bottom line is that no system is immune to worms
Systems may be quite bothered with worms and viruses, even when immune.
François Pinard http://www.iro.umontreal.ca/~pinard