There probably will be, just because its a simple virus with a simple scope. Microsoft, for what its worth, is very fast with patches. The problem is that some patches are going to be more complex and take more time than others. Apples are not immune to viruses or "safer" than PC's - its just that they have a far, far smaller market share so hackers don't waste time with them.
Being Unix-based (its not, so far as I know, a licensed Unix but I may be wrong) doesn't make it inherently safer. Windows is Unix-based, just not POSIX compliant, or really anything compliant in general. I don't know of any OS that doesn't have its roots in Unix. SunOS is the "safest" Unix just because it used to be the most widely used, and Cray's used to be the worst because they were rarely targetted and normally not exposed to the internet directly, but I have no idea what the status quo is today. Linux is probably the absolute safest thing out there right now, just because of the N variations out there.
Anyway, just babbling away here...