Hi, Rowena. Thank you for your reply. I am not presuming they brought bedbugs - I just included that as an example of what could end up in a host's house. I agree, also, that you could never prove a guest brought something into the house: everyone in today's world moves around so much... I could have brought something back from my last stay in a hotel. I was pondering that last night as I went for a walk, and saw a cockroach on the sidewalk, first time I ever observed that in this town. Might be because we have had an especially warm and wet summer.
Insect control is something I decided I will start planning for and budgeting for, as being in the hospitality business with a steady stream of visitors from all over the world means 'when' vs 'if' something happens.