### **Core Concept**
Tetanus prophylaxis involves administering tetanus toxoid (TT) or tetanus immunoglobulin (TIG) to prevent tetanus infection in individuals with a history of tetanus exposure, including wounds contaminated with tetanus spores. The decision to administer TT or TIG depends on the patient's vaccination history and the severity of the wound.

### **Why the Correct Answer is Right**
For patients with a complete tetanus vaccination series (i.e., ≥3 doses of tetanus toxoid), a booster dose of tetanus toxoid is recommended for wounds that are not clean (e.g., contaminated wounds). Since this patient had received TT vaccination 10 years ago, he is considered to be partially immune, and a booster dose of tetanus toxoid is indicated for his wound. Tetanus toxoid stimulates the production of antibodies against tetanus toxin, providing immunity against the disease.

### **Why Each Wrong Option is Incorrect**
* **Option A:** This option may be tempting, but it is incorrect because the patient has a history of tetanus vaccination, albeit 10 years ago. A booster dose of tetanus toxoid is necessary to ensure immunity against tetanus.
* **Option B:** This option is incorrect because tetanus immunoglobulin (TIG) is typically administered in cases of tetanus exposure in individuals who have not been vaccinated against tetanus or in cases where the patient's vaccination history is uncertain.
* **Option D:** This option is incorrect because a booster dose of tetanus toxoid is necessary for wounds that are not clean, and administering a booster dose without tetanus toxoid would not provide adequate protection against tetanus.

### **Clinical Pearl / High-Yield Fact**
In general, tetanus prophylaxis is recommended for wounds that are not clean (e.g., contaminated wounds), even in individuals with a history of tetanus vaccination. A booster dose of tetanus toxoid is necessary to ensure immunity against tetanus in such cases.

### **Correct Answer:** C. A booster dose of tetanus toxoid.