When a tetanus infection occurs, the wound is generally quite deep, for instance, reaching the subcutaneous fat or even the muscle layer in severe cases. Such deep wounds can create an anaerobic environment, which is conducive for the growth and reproduction of Clostridium tetani, an anaerobic bacterium. This bacterium produces exotoxins, primarily the tetanospasmin, which causes the associated clinical symptoms in patients. If it's merely a scrape or a superficial wound, tetanus infection is unlikely. Clinically, what is needed for such abrasions is to disinfect the area with iodine and then bandage it appropriately.