Let's just get some facts correct:
1. Shingles are not the result of a primary infection with chickenpxo but a reactivation of the virus which lies dormant in the dorsal ganglia after you have had an infection with chickenpox. Once you have had chickenpox you will carry the virus. Nothing you can do about it.
So MJ you colleague did not get his shingles off you! And DD you could not have triggered another outbreak of shingles of your mother.
2. Although chickenpox is classed as an innocent childhood disease it can happen at all age ranges and in common with other childhood diseases contracted at a more mature age a much more debilitating course. Mononucleosis infectiosa (kissing disease) is another one.
3. Although rare people can have chickenpox more than once.
FD