Cephalosporin and vaccines should not be given together, except for rabies and tetanus vaccines. Cephalosporin injection indicates an acute phase of bacterial infection or an acute attack of chronic infection in the body, which is a contraindication to vaccination, so cephalosporin can be injected first and the vaccine can be given after the condition has improved. Because the immunity of the patient is low during the infection period, vaccination can increase the risk of infection, especially when live vaccines are administered. In addition, there is a possibility that cephalosporin and some vaccines may interact, leading to increased adverse reactions and affecting the effectiveness of the vaccine. If you are bitten or scratched by an animal such as a cat or dog when cephalosporin is injected and you want to inject rabies vaccine or tetanus vaccine, it can be given urgently because rabies and tetanus are serious diseases and need to be injected as early as possible, otherwise the efficacy will be affected. The mortality rate after rabies and tetanus infection is high, especially rabies, the mortality rate after infection can reach 100%, so for the safety of life, it is important to give an emergency injection without delay.