The acronym TAT, which in medical terms means tetanus antitoxin, is a drug used to prevent tetanus. If you get cut by a sharp object, a deep cut, or a deeper wound from a sharp object, it is likely to create the best environment for anaerobic bacteria to live, causing Clostridium tetani to multiply and to contract tetanus. In this case, it is necessary to inject tetanus antitoxin to prevent the onset of tetanus. Tetanus antitoxin is relatively cheap and is derived from the serum of immune horses, not directly from human serum, so it requires a skin test because so many people are allergic to it. If there is a skin test allergy, and you still need to continue the injection, you need to use desensitization therapy for the injection, which requires several injections and is more painful. In this case, you can also choose a more expensive drug, which is human immunoglobulin for tetanus, because this immunoglobulin is derived from the human body and does not require a skin test.