Q. A 23-year-old woman has come to the emergency room with a deep wound in her left hand. The wound happened one hour ago while she was gardening with a small shovel, as a transverse 2-cm cut in the palm of the left hand, over the third metacarpal. The neurovascular examination of the finger is normal. Clinical examination of the finger's flexor tendons shows that the third finger's superficial and deep flexor tendons are intact. The wound is dirty with soil in it. Her medical history is unremarkable, and she receives no medications. She had full tetanus immunization; her last tetanus toxoid was about seven years ago. The hand x-ray shows no fracture or foreign body. You irrigate the wound with serum and decide to send the patient to the operating room for debridement, exploration of tendons, and wound closure. What is the best plan for tetanus prophylaxis in this patient?