The period from the onset of rabies exposure until the onset of symptoms is called the rabies virus incubation period, which is usually 2-3 months, ranging from as short as 5 days to as long as several years. Factors affecting the length of the incubation period of the virus include the distance of the site of infection from the nerve centers of the brain and the amount of virus infected. If the rabies virus causes disease, a certain number of viruses are needed, and the higher the number of viruses, the shorter the rabies incubation period. In addition, if the degree of abundance of injured nerves, the virus will be infected into the nerve tissue after a short period of replication within the muscle, so the more abundant the local nerve, the shorter the incubation period. The World Health Organization suggests that depending on the amount of invading virus, the density of neurons at the site of injury, and the proximity of the virus to the central nervous system, the incubation period of the virus ranges from 5 days to several years, with fewer people getting more than 1 year. Within 24 hours after being bitten by a dog, the patient should go to a regular hospital or epidemic prevention station for rabies vaccination. After being bitten by a dog, if the wound is bleeding, first squeeze the blood outward from the wound. Following this, use running tap water to rinse the wound for 30 minutes, and wash the wound with soap, and then disinfect it thoroughly with 75% alcohol. Try not to take a shower on the day of vaccination to avoid infection at the vaccination site.