Clostridium tetani is found in nature, in soil. Clostridium tetani may also be present in dishwashing water if it is contaminated. However, it should be noted that the contamination rate of Clostridium tetani is very high, but the incidence rate is not high, because Clostridium tetani is an anaerobic bacterium, the onset of the disease must have an anoxic environment, when the wound external opening is small, the internal deeper, and there is necrotic tissue in the wound, blood clots filled or compressed too tightly, the local ischemia, etc., it will propagate the Clostridium tetani reproduces in large quantities, so as to occur tetanus. Tetanus can be prevented, attention to early and thorough debridement after injury to improve local blood circulation is an effective preventive measure, but also through artificial immunization vaccination to achieve prevention. Once tetanus develops, it is extremely serious and has a high mortality rate, so it is important to consult a doctor in time to avoid delaying the condition.