The incubation period for rabies is usually 1-3 months, with a short period of 5-7 days for onset and very few cases exceeding 1 year. Therefore, rabies can be ruled out in most cases after 3 months of not developing rabies after being bitten or scratched by an animal with rabies. Rabies, also known as hydrophobia, is an acute viral infection caused by rabies virus attacking the central nervous system. Rabies is asymptomatic during the incubation period, but a transient viremia, similar to AIDS, can occur after rabies exposure. Over time, the virus gradually invades the nerves and organism, and the affected person becomes symptomatic. If the bite wound begins to have a localized anthrax sensation, redness and swelling increase, and fever, fear of water and sound gradually appear, the person enters the rabies symptomatic period. Rabies is the most dangerous disease, if the patient is infected with rabies virus, the mortality rate is about 100%, at this time the best prevention method that is injected rabies vaccine, it is recommended that animal bites or scratches promptly injected with this vaccine.