Vince:
Not very.
StaphStaph aureus food poisoning germs live on many of us, minding their own business. It has more to do with the interaction of the germ with the host than just the germ itself. In any case, if no one comes down with any skin issues in a couple of days, I think you and your co-workers don't have much to be concerned about.
Best.
Dr. R
Dr. R