TAT is an acronym for tetanus antitoxin. Tetanus antitoxin is an immune serum for horses, an antibody that is mostly used as a prophylactic injection for patients with potential tetanus risk due to trauma or other causes, as a passive immunization. Tetanus antitoxin is antigenic to the human body as a heterogeneous protein, so allergic reactions may occur after injection, and even severe anaphylaxis may occur, so an allergy test must be done before administration. In addition to preventive tetanus antitoxin can also be used for the treatment of tetanus, open trauma, especially when the wound is deep or contaminated more seriously, should be promptly used tetanus antitoxin for prevention. If you have tetanus symptoms or suspected tetanus symptoms, you should also promptly use antibiotics for treatment, and you must do an allergy test before use. For allergy test positive people can apply desensitization injection, or use tetanus immunoglobulin, tetanus immunoglobulin does not need to do allergy test, but the price is more expensive.