A nail in the foot without tetanus does not necessarily cause serious consequences, but it needs to be given sufficient attention. The foot was pierced by a nail, easy to infect tetanus bacteria, tetanus bacteria if successful reproduction, it is more harmful. The tetanus bacillus is an anaerobic bacteria, the affected area and in the less exposed to air foot, even if the wound is relatively superficial, should be a comprehensive cleaning treatment. When the wound is deep, the risk of tetanus multiplication increases. Usually within 2 weeks of being lacerated, preferably within 24 hours, the injured person should receive a tetanus shot and be observed for normal healing, inflammation and localized redness, etc. The incubation period of tetanus bacillus is 2 weeks to 2 months, if the wound appears infectious inflammation, the injured person exists chewing weakness, involuntary muscle twitching, poor spirit, weakness and other phenomena, may be infected with tetanus, should promptly seek medical attention.