Injections of tetanus antitoxin are required in the presence of open wounds, deeper wounds, and in newborns after treatment of the umbilical cord. 1. Open wounds: Tetanus bacillus is a kind of anaerobic bacteria, which usually exists in rust and soil. When patients have open wounds, such as when they are touched by rusty iron, they should be injected with tetanus antitoxin in time. 2. Deeper wounds: after being stabbed by wood chips, nails and so on, there will be small and deep wounds, meanwhile, tetanus virus is very likely to exist in the nails and wood chips, small and deep wounds are very conducive to the growth and reproduction of tetanus bacillus, so tetanus antitoxin should be injected in time. 3. Newborns: After the umbilical cord of a newborn is treated, tetanus antitoxin should be injected in time to prevent tetanus in newborns. Infection with tetanus bacillus is very harmful to the patient’s body, so once a wound appears on the body, tetanus antitoxin should be injected in time.