You don’t necessarily get tetanus after being cut. Whether or not you get tetanus depends on the size and depth of the wound. Tetanus bacillus is an anaerobic bacterium, so the degree of contact between the wound and oxygen directly determines whether it can survive and cause disease. If the rusty iron does not scratch the skin, only superficial skin wounds such as broken skin, as long as the local cleaning and disinfection treatment can be carried out, generally will not lead to the occurrence of tetanus. When a deeper wound occurs from a scratch, causing it not to be easily and thoroughly cleaned, a thorough debridement treatment should be done promptly at the hospital, with repeated rinsing with hydrogen peroxide and disinfection with iodophor, which may require suturing if necessary. Try to prevent tetanus by injecting tetanus antitoxin within 24 hours. In addition to emergency treatment, the injured person needs to change the treatment regularly until the wound is healed and avoid contact with water causing secondary bacterial infection. Oral antibiotics can be taken under the guidance of a physician to prevent septic infection of the wound.