Rabies is a viral disease in mammals that infects the central nervous system and, if left untreated, attacks the brain and ultimately causes death. While any mammal could transmit the disease, the animals most likely to do so in the United States include bats, coyotes, foxes, raccoons, and skunks. If you, a family member, or a friend are bitten by an animal which may carry rabies, seek medical attention immediately.