Direct harm: Wild mice carry a wide range of viruses and bacteria. Whether it is dead or alive, touching a mouse could give you a disease. Some of the most common, salmonella, tularemia, and leptospirosis. The latter is quite dangerous as it is contracted from rat urine. Just touching a few drops of mouse urine can lead to kidney and liver failure. Indirect hazards: Mice can gnaw at metal & electrical wiring in the house, resulting in faults and fires. This makes mice very dangerous! Even if there is no fire, the mice can destroy electric appliances, which cost money to replace. Mice also host various parasites, including fleas, ticks, and mites. A bite from either of these parasites can cause Lyme disease, pox, typhus, or bubonic plague. The latter can be fatal if not detected early. Children and the elderly are at the highest risk of developing health complications from mice.