A rabies vaccine booster is used if you are scratched or bitten again within six months to three years after a full five-dose rabies vaccine. Within half a year to one year, 2 booster shots are usually needed, and 3 booster shots are needed within one to three years. 1. Within 6 months to 1 year: 2 booster shots are required, which are given on the same day and on the 3rd day. 2. Within 1~3 years: booster injections are needed, which are injected on the same day, on the 3rd day, and on the 7th day, respectively. Another situation is to prevent the number of antibodies in the body from dropping too much, which requires a booster injection after 1 year, and then every 3~5 years thereafter. Rabies vaccine booster injection is also referred to the ordinary rabies vaccine specific injection method should also be based on the individual’s physical condition needs to follow the doctor’s advice to choose.