Tetanus is an infectious disease caused by a broken wound infected by the bacillus tetanus. There is an incubation period because the bacteria need a period of time to multiply and produce toxins before they can cause illness. The incubation period after tetanus infection is usually about 1 week, for example, if the umbilical cord of a newborn is not treated and infected with tetanus, the incubation period will be 5-7 days; in a few patients, the incubation period can be as short as 1-2 days, but there are also individual patients with an incubation period of up to several months, because the tetanus bacterium invades the body needs to grow and reproduce in an oxygen-deficient environment to produce toxins, if the environment in which the tetanus bacterium is located does not reach If the environment in which the tetanus bacterium does not reach the conditions of oxygen deprivation, the bacteria may be latent in the wound until the local environment reaches the conditions required for its growth and reproduction will cause the disease, in this case, the incubation period may be longer. The shorter the incubation period, the worse the prognosis of the disease. The tetanus bacillus enters the body through a broken wound and produces a very strong exotoxin in an oxygen-deprived environment, mainly invading the nerve tissue and causing symptoms such as muscle tonicity or muscle spasm, and in severe cases, causing diaphragmatic spasm and laryngospasm edema, which can be life-threatening. Tetanus is a critical illness, for tetanus should recognize the importance of prevention, once there is a broken wound, especially a seriously contaminated wound, in order to be sure to properly handle the wound, strict disinfection, timely injection of tetanus toxoid or tetanus antitoxin to prevent.