Mice carry many forms of bacteria quite similar to rats, and can carry diseases such as salmonella and murine typhoid . They can cause serious food poisoning when in contact with food preparation areas.
 

Recognition: A House mice will be 75–100mm nose to tail. They can be a wide range of colours from brown, black, white, grey or any shades in between vary in colour from white to grey and light brown to black. They have short hair.
Poor cleanliness is a surefire way of attracting mice and giving them the perfect environment to rapidly expand their numbers.

Signs of infestation: Sightings of live or dead or signs of droppings. Mice droppings are blackish in colour and about 3 mm long, with a strong musty smell.As with rats, mice will tread the same routes, known as runs. Runs can sometimes be seen as trails in dust and earth and flattened routes in the grass. Greasy smears may also indicate repeated contact with their fur. Mice will knaw entry and exit holes and may also damage goods. Urine will be found in  feeding areas and along runs and will glow under UV light. 

Facts:  Mice can produce six to ten litters throughout the year, with each litter from 4 to 8 babies. Mice become mature in 6 to 8 weeks and live an average of just 4 months. Houshold items and food contaminated by their droppings and urine, must be disposed of. House mice will also chew through electrical cables causing damage to items and risk of fire.
A mouse will  consume only 3 to 4 grams of food per night, but make frequent visits to the food source, taking a very small amount every time.
Mice are nocturnal creatures so are not normally seen on site.  Mice droppings are blackish, about 3 mm long, and have a strong musty smell.
Footprints – on muddy or dusty surfaces. Burrows – entrance holes are approximately 3 cm in diameter. Nests – sometime found indoors, in lofts or under floorboards. Gnawing – mice gnaw continually, even on non-food materials, in order to wear down their front teeth.

Diseases:  Mice  can transmit diseases, particularly salmonellosis, Hantavirus and Lyme Disease
average mouse will consume only 3 to 4 grams of food per night.