Tetanus bacterial infection generally refers to relatively deeper wounds. A deeper wound creates an anaerobic environment locally, where tetanus-causing bacteria can reproduce and grow, leading to infection. If the wound is just a scrape and not deep, it's less likely to form an anaerobic environment. In such cases, the likelihood of developing tetanus is extremely low. From personal experience, if it's just a minor scrape, simply disinfecting the area with iodine is sufficient; there is generally no need for a tetanus antitoxin injection.