House mice cause an inestimable amount of damage to foodstuffs and structures, particularly wall and attic insulation, electrical wiring and other building components. House mice contaminate food with their hair, urine and droppings.
Additionally, mice and their parasites transmit a number of diseases to humans, including salmonellosis (foodpoisoning), rickettsialpox, lymphocytic choriomeningitis, leptospirosis, ratbite fever, tapeworms and organisms that cause ringworm.
They can be differentiated from young rats. Young rats will have larger hind feet and head size proportionate to the body.
Find more info at http://letusgetridof.com/how-to-get-rid-of-mice/