Glad you asked, Hanta Virus is a disease carried by common field mice, It can be transmitted by mucous membrane contact with mouse droppings, and can lay dormant for a long time. There have been reported deaths in Western Canada (Very few) but apparently it does happen. The disease is most commonly transmitted from the hands to the eyes, mouth, nose, etc. but health officials report that the organisms can by breathed in when sweeping up comtaminated feces. A vacuum cleaner seems to work to contain it safety, but if removing mouse droppings by hand, a dust mask and rubber gloves are a good idea. A little caution can go a long way.