The protection period of rabies vaccine is about half a year, after half a year the effective concentration of antibody will gradually decrease, it is recommended to receive rabies vaccine under the guidance of a doctor after being bitten by a dog or cat. Rabies vaccination is a means of immunoprophylaxis after being scratched by dogs and cats, which can effectively prevent patients from being infected with rabies after being scratched by dogs and cats by activating and increasing the number of antibodies in the body to achieve the purpose of eliminating the rabies virus. The rabies vaccine produces antibodies in about 1-2 weeks after vaccination, and the effective concentration of antibodies lasts for about half a year, after which the concentration gradually decreases. Therefore, it is recommended that patients who have been bitten by cats or dogs again after half a year of vaccination should be revaccinated with the rabies vaccine in a timely manner. In addition, if a third-degree exposure to the rabies virus is considered, immunoglobulin or antiviral serum should be injected immediately as prescribed by the doctor. The protection period of rabies vaccine is about half a year, after half a year, the effective concentration of antibody will gradually decrease, it is recommended that after half a year of vaccination, if bitten by cats and dogs again, rabies vaccine should be re-vaccinated in a timely manner.