After being bitten by a cat, it is recommended that the rabies vaccine be injected within 24 hours of the injury, and the earlier the injection, the better the immunization effect will be. If more than 24 hours later, it is possible that the rabies virus is really infected, and the virus reproduces and produces toxins in the wound, and it is very likely that the virus has slowly invaded all the organs and tissues of the body, and rabies may occur. However, if the rabies vaccine is administered more than 24 hours later, the vaccine is more or less effective because the vaccine also produces antibodies. If rabies does occur in the body, the vaccine will minimize the impact of the virus on the organs of the body and minimize the toxic side effects caused by the virus.