http://service1.symantec.com/SUPPORT...01092016473811
Thought some people may be interested in this.
I can quote the whole thing, it's pretty small:
"
Are Macintoshes affected by the Nimda virus?
Situation:
You heard that there is a new worm/virus threat that goes by any of the following names:
WW32/Nimda@mm
PE_NIMDA.A
I-Worm.Nimda
W32/Nimda-A
Win32.Nimda.A
You wonder if there is any hazard of this worm/virus infecting your Macintosh.
Solution:
This is a Windows specific worm/virus and cannot infect a Macintosh. Since this is a worm/virus that can be email based, a Macintosh user could pass on the worm/virus through the infected email, by forwarding it to a Windows user.
NOTE: If your Macintosh has a shared network drive that can be accessed by a PC that is infected with Nimda, that drive can be filled with infected files, leaving you with less available space on the shared drive. To protect your Macintosh systems, you may want to disconnect any shared network drives until you are sure that your network is no longer infected with the Nimda worm/virus.
For more information about Nimda, please go to:
http://www.symantec.com/avcenter/venc/data/[email protected]