Rats and mice, and the parasites that come with them, can carry a number of diseases. Some of these diseases are potentially deadly to humans, like Hantavirus, Listeria, Rat-Bite Fever, Salmonellosis and the Bubonic Plague. Admittedly, most of these diseases are more common in other parts of the world than they are in California, but it should help you understand why people and non-domesticated rodents should maintain separate residences.
In addition to health issues, rats and mice can also take a toll on your property. They’re known to eat just about anything – including parts of your house. Their teeth can gnaw through insulation, wallboards, card board, even wood. Some are especially fond of electrical wiring and that can lead to real danger. Exposed wires resulting from these pests are believed to cause 25% of U.S. house fires.