Surgical department admitted a 37-year-old patient with a big crushed wound of his left thigh 4 hours after he got this trauma. What is the main provision for successful prevention of gaseous gangrene?

Answer options

1. Wound lavage with 6% solution of hydrogen peroxide
2. Infiltration of soft tissues around the wound with antibiotic solution
3. Removal of necrotic tissues and timely surgical processing of the wound
4. Injection of specific serum 30 000 U
5. Injection of specific serum 3 000 U