The rabies vaccine is only given once and cannot be effective for life. For insurance purposes, since this antibody will gradually decline over time, it is recommended that rabies vaccination be boosted for bites from dogs or other animals more than six months after the complete rabies vaccination, without the appropriate blood tests. If more than three years have elapsed, the full vaccination should also be given. Therefore, the rabies vaccine does not last for life even after the full course of five shots. However, in contrast, a dog bite that bleeds again after the rabies vaccination does not require another injection of rabies serum or immunoglobulin. From this aspect, the corresponding effects of the rabies vaccine can last for a lifetime after the complete five shots. If the full five doses of the rabies vaccine have not been given and only one dose has been given, antibodies have not been produced at this time and will not last for a lifetime of effectiveness.