Rabies is mainly caused by scratching or biting by dogs, wolves and wild animals infected with rabies virus, which is transmitted to humans through saliva. Ordinary contact with a rabid person, including shaking hands, hugging, and sharing utensils, does not cause infection, but most blood may cause some risk of infection. Saliva and blood products produced by a rabid person should be handled strictly to prevent the possibility of transmission. To treat or prevent rabies, one should start by avoiding being bitten or scratched by dogs or felines, and once this happens one should promptly go to the hospital for debridement and maximum prevention of rabies by intramuscular injection of rabies vaccine.