What's the worry?
You are 26 years old and I'm glad you're reading up on health.
I am puzzled, though, as to why you think you can catch hantavirus or anything else from being around folks vacuum-cleaning. Hantavirus is mostly a disease of squalor transmitted by very close involvement with mouse droppings. The world is full of dangers, known and unknown, but fearing ordinary daily things is something you can't do.