Tetanus Control

Tetanus: Agent & Epi - Lockjaw Lowdown

• Agent: Clostridium tetani
  • Gram-positive, anaerobic, spore-forming bacillus.
  • Produces potent neurotoxin: Tetanospasmin.
• Reservoir: Soil, dust, animal (especially horse) feces.

  ⭐ Spores of Clostridium tetani are highly resistant, found in soil and animal feces, and can survive for years.

• Transmission:
  • Contamination of wounds (punctures, abrasions, burns) with spores.
  • Unhygienic delivery practices (Neonatal Tetanus - NNT).
  • Unsterile surgical procedures, ear piercing, tattooing, animal bites.
• Incubation Period: Typically 3-21 days (average 10 days); can range from 1 day to several months.
• Epidemiology (India):
  • MNTE (Maternal and Neonatal Tetanus Elimination) status achieved (2015).
  • Non-neonatal tetanus cases still occur.
  • Higher risk in unimmunized or inadequately immunized individuals.

Tetanus: Clinical Features - Spasms & Symptoms

• Incubation: 3-21 days (avg. 10); shorter IP → severe disease.
• Early:
  • Trismus (lockjaw): commonest initial sign.
  • Neck stiffness, dysphagia, restlessness.
• Spasms (Tetanospasms):
  • Painful, involuntary, reflex; triggered by minimal stimuli (noise, light).
  • Generalized:

    • Risus sardonicus (fixed grin).

    • Opisthotonus (back arching).

    • Abdominal rigidity (board-like).

    • Laryngeal/pharyngeal spasms → respiratory distress.

  • Autonomic dysfunction (severe cases): labile BP/HR, sweating, fever.
• Consciousness: Usually alert.

⭐ Tetanospasmin neurotoxin blocks inhibitory neurotransmitter (GABA, glycine) release in CNS, causing disinhibition of motor neurons & spasms.

Tetanus: Management - Unlocking the Patient

• Primary Goals: Neutralize unbound toxin, stop C. tetani growth, control spasms, ensure supportive care.
• Wound Management: Surgical debridement of necrotic tissue.
• Antitoxin:
  • Human Tetanus Immunoglobulin (HTIG): 3000-5000 IU IM (single dose).
  • Equine Antitoxin (ATS): 50,000-100,000 IU IV/IM (after sensitivity test, if HTIG unavailable).
• Antibiotic Therapy:
  • Metronidazole (DOC): 500mg IV q6-8h for 10-14 days.
  • Penicillin G (alternative): 10-12 million units/day IV (caution: may worsen spasms).
• Control of Spasms & Rigidity:
  • Benzodiazepines: Diazepam 10-20mg IV q3-8h or Midazolam infusion.
  • Magnesium Sulfate: 5g IV loading, then 1-2g/hr IV ($MgSO_4$).
  • Severe cases: Neuromuscular blockers + mechanical ventilation.
• Supportive Measures: Airway protection, adequate nutrition, quiet/dark room, manage autonomic instability.

⭐ Human Tetanus Immunoglobulin (HTIG) is preferred over equine antitoxin (ATS) for passive immunization due to a lower risk of anaphylaxis.

Tetanus: Prevention & Control - Shield Against Tetanus

• Active Immunization: Tetanus Toxoid (TT); Td vaccine for older children/adults.

  • NIS: DPT (6, 10, 14 wks); Boosters: DPT (16-24 mths, 5-6 yrs), TT (10, 16 yrs).
  • Pregnant Women: Two TT/Td doses (or one booster if primary series complete & last dose <10 yrs).

• Passive Immunization (Post-Exposure Prophylaxis):

  • Human Tetanus Immunoglobulin (hTIG): 250-500 IU IM.
  • Equine Anti-Tetanus Serum (ATS): 3000-6000 IU IM (after sensitivity test).

• Neonatal Tetanus (NNT) Prevention:

  • Maternal immunization (TT/Td).
  • Clean delivery practices & 📌 5 Cleans: Clean hands, surface, cord tie, blade, cord stump care.

• Wound Management: Prompt surgical toilet, antibiotics (Metronidazole). Prophylaxis per flowchart.

• Control Strategies: High routine immunization coverage, surveillance, clean deliveries.

⭐ India achieved Maternal and Neonatal Tetanus Elimination (MNTE) status in August 2015.

High‑Yield Points - ⚡ Biggest Takeaways

• Agent: C. tetani (anaerobe, spores); Toxin: Tetanospasmin (blocks GABA/glycine).
• Signs: Trismus (lockjaw), risus sardonicus, opisthotonus, painful spasms.
• NNT: Prevented by maternal TT & clean delivery; India achieved NNT elimination.
• Prophylaxis: Active immunization (TT/Td), passive (TIG), meticulous wound care.
• Clean Wounds: TT if <3 doses or last dose >10 yrs.
• Tetanus-prone Wounds: TT + TIG if <3 doses/unknown; TT if last dose >5 yrs.
• Pregnant Women: Two TT/Td doses or one booster if vaccinated_previously_vaccinated_