We have mice!
hantavirus is most common in deer mice, which are not the typical house mouse of which there are several kinds
still better to be safe than sorry, error on the side of the angels
rather than steel wool, get a couple of the copper dish pads, they unravel to a ~3ft copper sock
it wont rust and is a long enough piece to more easily seal foundation junction points
if your little finger fits into a hole, a mouse can enter
don't forget porches, entry steps, and beneath decks
move landscape a couple feet from the foundation