Rabies is primarily contracted through bites from rabid dogs who have not been vaccinated against the disease. The rabies virus is present in the saliva of rabid dogs, cats, and there is also a risk of infection from bats if they carry the rabies virus and one is bitten by such a bat. Generally, rabies infection occurs through bites or scratches from animals carrying the rabies virus; there have been no cases of transmission from human to human. Rabies is a fatal disease, so if there is exposure, it is essential to take preventive measures, as there is no cure.