While mice are certainly cute to look at, even microdroplets of urine can cause allergies in children, and mice can bring dangerous pests like fleas, mites, ticks, and lice into your home.
In rare cases, mice can even be carriers of the Hantavirus pulmonary syndrome (HPS), a serious respiratory disease transmitted by infected rodents through urine, droppings or saliva. Anyone who comes into contact with the Hantavirus is at risk for HPS, and humans can contract the disease just by breathing in aerosolized virus.
To keep from contracting HPS, always clean up rodent urine or droppings with a wet mop. Avoid cleaning methods like vacuuming, which could aerosolize the rodent urine or feces and spread the disease.