Tetanus bacillus can be prevented by the injection of tetanus antitoxin, and it is best to administer it within about a week. Generally, the sooner the vaccine is administered, the better, with the most effective safety period being within 24 hours. That is, if the tetanus antitoxin can be injected within 24 hours, the probability of developing tetanus will almost drop to zero. Of course, it is usually possible to inject this vaccine within this week, as the incubation and onset period of tetanus bacillus generally occurs within a week. Therefore, the earlier the treatment, the higher the probability of prevention. Of course, this vaccine should be used only when certain symptoms appear, and it must not exceed one week. If it exceeds one week, the tetanus antitoxin may become ineffective.