The Hantavirus is a disease in mice that was first detected in the American South-West in the late 1980’s and eventually found its way into Canada and Ontario. The Deer Mice, characterized by being brown on top and white underneath, are the principal carrier of this disease and it’s contracted by inhaling particulate matter found in their fecal and urine droppings. Mortality in humans who contract the disease is approximately 60% so, if you have Deer Mice, you should be very careful when cleaning up their droppings. The safest way of dealing with these droppings is to contact a pest control specialist.