Tetanus Wound Prophylaxis Advisor

◆ Evidence-Based Pearls The Master Prophylaxis Table

⚠ Cardinal Rule: Treat unknown or uncertain vaccination history as ZERO previous doses. Natural tetanus infection does NOT confer immunity; vaccination is required even after recovery from clinical tetanus.

Vaccination History	Clean, Minor Wound	Tetanus-Prone Wound
Unknown or <3 doses	Td/Tdap: YES TIG: No	Td/Tdap: YES TIG: YES (250 IU)
≥3 doses, booster <5 yrs	Td/Tdap: No TIG: No	Td/Tdap: No TIG: No
≥3 doses, booster 5-10 yrs	Td/Tdap: No TIG: No	Td/Tdap: YES TIG: No
≥3 doses, booster >10 yrs	Td/Tdap: YES TIG: No	Td/Tdap: YES TIG: No*

⚠ *Immunocompromised Exception: Patients with HIV/AIDS or severe immunodeficiency who have contaminated wounds should receive TIG regardless of their vaccination history.

Wound Classification: Clean vs Tetanus-Prone

Feature	Clean, Minor	Tetanus-Prone ⚠
Age of wound	<6 hours	>6 hours
Configuration	Linear, sharp edge	Stellate, avulsion, crush, missile
Depth	<1 cm	>1 cm (deep)
Mechanism	Sharp object (knife, glass)	Puncture, crush, burn, frostbite
Contamination	None / minimal	Soil, faeces, saliva, dirt, rust
Tissue viability	Viable, well-perfused	Devitalised, ischaemic, necrotic
Infection	Absent	Signs of infection present

💡 Pearl: If ANY single feature from the tetanus-prone column is present, classify the wound as tetanus-prone. When in doubt, treat as tetanus-prone.

Which Vaccine? Td vs Tdap vs DTaP

Patient Age	Preferred Vaccine	Alternative
<7 years	DTaP (or DTwP in NIS context)	DT if pertussis contraindicated
7-18 years	Tdap (if never received Tdap)	Td if Tdap previously received or unavailable
≥19 years	Tdap (if never received Tdap)	Td if Tdap previously received
Pregnant	Tdap 27-36 weeks (each pregnancy)	Td if Tdap unavailable

Key Difference: Lowercase letters (d, p) denote reduced antigen content in adult formulations. Paediatric DTaP has 3-4 times more diphtheria toxoid than adult Td.
Tdap Priority: Every adult should receive at least 1 lifetime dose of Tdap. If Tdap status is unknown, use Tdap for wound management rather than Td.
Indian Context: Td replaced TT in the NIS (2019). In government settings, Td is the standard. Tdap availability is primarily in private practice.

Tetanus Immunoglobulin (TIG): The Details

Parameter	Detail
Product	Human TIG (preferred). Equine ATS if human TIG unavailable (higher anaphylaxis risk; requires sensitivity testing).
Dose	250 IU IM for wounds of average severity. 500 IU if wound >24 hours old or heavily contaminated.
Administration	IM injection. When given with Td/Tdap, use separate syringes at different anatomical sites.
Mechanism	Provides immediate passive immunity by neutralising circulating tetanus toxin. Cannot reverse toxin already bound to nerve endings.
Duration	Passive protection only. Patient still requires active immunisation (Td/Tdap) for long-term immunity.

Wound Management: The Surgical Essentials

⚠ Critical: Tetanus prophylaxis (vaccine + TIG) is NOT a substitute for proper wound care. Thorough cleaning and debridement of devitalised tissue is essential.

Irrigation: Copious irrigation with normal saline or clean running water under pressure. Remove all foreign material.
Debridement: Excise devitalised, necrotic, and ischaemic tissue. C. tetani thrives in anaerobic, devitalised tissue.
Closure: Tetanus-prone wounds should generally be left open or closed by delayed primary closure to avoid creating anaerobic conditions.
Antibiotics: Routine antibiotic prophylaxis is NOT indicated solely for tetanus prevention. However, contaminated wounds may warrant antibiotics for polymicrobial infection risk (Metronidazole or Penicillin if clinical tetanus is suspected).

ER Traps & Common Errors

⚠ Sobering Statistic: In a California surveillance study (2008-2014), among tetanus patients who sought medical care for acute injury, only 22% received appropriate prophylaxis. Case-fatality rate remains 13-18% even with modern intensive care.

✗ Trap: Giving only TIG without starting active immunisation. TIG provides temporary passive immunity only; the patient remains unprotected long-term.
✗ Trap: Assuming "rusty nail" is the only mechanism. Tetanus-prone wounds include garden injuries, animal bites, burns, compound fractures, and even surgical wounds.
✗ Trap: Not completing the primary series. If <3 doses have been received, the patient needs a full primary series: dose 2 at ≥4 weeks, dose 3 at 6-12 months after dose 2.
✗ Trap: Boosting too frequently. Giving Td boosters at <5 year intervals increases the risk of Arthus-type hypersensitivity reactions.
✓ Pearl: Do not restart a vaccine series if doses are delayed. Continue from where the patient left off.
✓ Pearl: ~25% of tetanus cases have no identifiable wound or portal of entry. Ensure routine 10-year boosters are up to date.

Tetanus in India: Context

Maternal & Neonatal Tetanus: India was certified for elimination of MNT by WHO in July 2016. However, neonatal tetanus cases continue to be reported (409 cases per HMIS 2021-22).
Adult Tetanus: Cases are primarily in unvaccinated or partially vaccinated elderly agricultural workers. Td vaccine is now given at 10 and 16 years and to pregnant women under NIS.
Diphtheria Resurgence: The shift from TT to Td in 2019 was driven by rising diphtheria cases in older age groups with waning immunity. Td provides dual protection.
Equine ATS Availability: In resource-limited Indian settings where human TIG is unavailable, equine ATS (1,500-3,000 IU IM after sensitivity test) may be used. However, human TIG is strongly preferred due to lower risk of serum sickness.

Special Populations

Population	Key Consideration
Pregnant Women	Td/Tdap is safe. Tdap is preferred at 27-36 weeks (each pregnancy) for passive neonatal pertussis protection. Category C vaccine.
HIV/AIDS	Give TIG for ALL contaminated wounds regardless of vaccination history. Immune response to toxoid may be impaired.
Elderly (≥65 yrs)	Incidence is twice as high as in younger adults (immunosenescence + rural occupation + missed boosters). Ensure 10-year booster compliance.
Infants <6 weeks	No tetanus toxoid vaccine is licensed. Give TIG only for contaminated wounds.
Arthus reaction history	Do not give Td/Tdap booster more frequently than every 10 years. For wound management, give TIG alone if within 10 years of last dose.