Hi @Chev. Have you had chicken pox?
You don't actually "catch" shingles, but if you haven't had, or been immunised against chicken pox, you could get that.
I think the acute immunosuppression is over reasonably quickly after your last chemo, but longer term, who knows, though I'm sure that chemo has long term effects on how our immune system functions.
Mind you, that could also be a side effect of having had cancer. Who knows.
Take sensible precautions, don't touch your colleague, and especially don't touch any of the blisters
Take care