Mice carry diseases such as Salmonella and they can also transmit a type of Leptospirosis, but not Weil's disease. Their continual dribble of urine contaminates food and feedstuffs. They are a particular problem in grain stores, warehouses, shops, hospitals and even domestic premises. [mmm cornflakes anybody?] Entering a new location through gaps as small as 6mm, mice build nests which are hard to find, populating an area with new colonies quickly with devastating effect. Because mice can reach sexual maturity 42 days after birth, populations grow much faster than those of rats, which take about twice the time to reach maturity. Purloined from: http://www.dudley.gov.uk/council/cleansing/mice.htm Get rid of it - even if you put it in the waste bins again. It has friends. It poos in your food. It is not cute, it's a menace to your health.