Hantavirus is already present in the US, and has been for years. Hot spots are the southwest and other places such as along the Appalachian trail at the trail shelters. Mice and other rodents carry it. It can be present in rodent feces and other rodent debris. When cleaning up after rodents use a HEPA filter, mask, and possibly lightly spray the area to keep dust down.
When cleaning up rodent leavings we always wet with Lysol and let it sit for five minutes before starting work.