Tetanus injection

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Tetanus injection

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tetanus injection vaccine indications schedule wound prophylaxis 2025

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tetanus toxoid vaccination prophylaxis

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Tetanus Injection

What Is Tetanus?

Tetanus ("lockjaw") is caused by Clostridium tetani, a Gram-positive, anaerobic spore-forming bacillus found in soil and animal/human intestines. It enters the body through wounds and produces tetanospasmin, an exotoxin that binds irreversibly to motor neurons, blocks inhibitory neurotransmitter release, and causes sustained, painful muscular contractions. The toxin is lethal at just 2.5 ng/kg - one of the most potent microbial toxins known.

Incubation period: 3-21 days (mean ~8 days)
Shorter incubation = more severe disease and worse prognosis
Goldman-Cecil Medicine, p. 3060
Bailey and Love's Surgery 28th Ed., p. 476

Types of Tetanus Injection

There are two distinct injection types used in tetanus management:

1. Active Immunisation (Tetanus Toxoid - TT)

A vaccine that stimulates the patient's own immune system to produce antibodies.

Vaccine	Components	Used for
DTaP	Diphtheria + Tetanus + acellular Pertussis	Children under 7
Tdap	Tetanus + reduced diphtheria + acellular Pertussis	Adolescents, adults, pregnant women
Td	Tetanus + reduced diphtheria	Booster in adults
TT	Tetanus toxoid only	Where combination not available

Dose: 0.5 mL intramuscularly (deltoid in adults; anterolateral thigh in infants)

2. Passive Immunisation (Tetanus Immunoglobulin - TIG / ATG)

Pre-formed antibodies that immediately neutralize circulating tetanospasmin.

Human Tetanus Immunoglobulin (TIG/HTIG): Preferred. 500 IU IM for prophylaxis; 3,000-10,000 IU for treatment of established tetanus.
Equine Antitoxin (ATG): Alternative if TIG unavailable; higher risk of anaphylaxis.
Goldman-Cecil Medicine, p. 3060
Bailey and Love's Surgery 28th Ed., p. 476

Primary Vaccination Schedule

A primary series = minimum 3 doses of tetanus toxoid-containing vaccine.

Age Group	Schedule
Infants (DTaP)	2, 4, 6 months; boosters at 15-18 months and 4-6 years
Adolescents (Tdap)	Single dose at 11-12 years
Adults not previously vaccinated	3-dose series (0, 1-2 months, 6-12 months)
Pregnant women	Tdap in each pregnancy (27-36 weeks gestation)

Wound Prophylaxis (Post-Injury)

This is the most common reason for a tetanus injection in clinical practice.

Clean / Minor Wounds

Vaccination History	Action
< 3 doses or unknown	Give vaccine + TIG
≥ 3 doses, last dose < 10 years ago	No action needed
≥ 3 doses, last dose ≥ 10 years ago	Give vaccine booster only

All Other Wounds (contaminated with dirt, feces, soil; puncture; animal bites; burns; crush injuries)

Vaccination History	Action
< 3 doses or unknown	Give vaccine + TIG
≥ 3 doses, last dose < 5 years ago	No action needed
≥ 3 doses, last dose ≥ 5 years ago	Give vaccine booster only

Important: For grossly contaminated or cavitating wounds, give both the toxoid AND 250-500 U ATG/TIG. - CDC wound management guidance

Treatment of Established Tetanus

Tetanus disease requires ICU-level care with several simultaneous interventions:

Passive immunisation: TIG 500 IU IM immediately (neutralizes unbound toxin)
Active immunisation: Tetanus toxoid concurrently (at a different site) - the disease does not confer immunity
Wound debridement: Eliminate anaerobic environment; delay wound manipulation 2-3 hours after TIG to minimize toxin release
Antibiotics: IV Penicillin G 10-24 million U/day for 10-14 days (metronidazole is an alternative)
Muscle spasm control: Diazepam IV 5 mg increments; if refractory, neuromuscular blockade with vecuronium
Autonomic dysfunction: Labetalol for hypertension; norepinephrine for hypotension
Ventilatory support: Intubation/tracheostomy if laryngospasm or respiratory failure

Overall mortality in established tetanus is approximately 45%; prognosis is worse with shorter incubation period and a short interval from first symptom to first spasm.

Goldman-Cecil Medicine, p. 3060-3061
Bailey and Love's Surgery 28th Ed., p. 477

Special Populations

Pregnant women: Tdap recommended in every pregnancy (27-36 weeks), transfers maternal antibodies to fetus and protects against neonatal tetanus
Immunocompromised patients: Same schedule; TIG may be given for any wound regardless of vaccination history
Neonatal tetanus: From C. tetani contaminating the umbilical stump; preventable by vaccinating the mother

Key Points Summary

Tetanus toxoid is 0.5 mL IM; TIG is 250-500 IU IM prophylactically
Give them at separate sites when both are indicated
Boosters every 10 years in healthy adults (every 5 years for contaminated wounds if prior dose was 5+ years ago)
Tetanus does not provide natural immunity after infection - always vaccinate recovering patients
A 2025 systematic review (PMID 39814168) confirmed that the vast majority of adult tetanus fatalities occur in unvaccinated individuals, reinforcing the importance of primary vaccination and timely boosters

In pregnant vaccine is needed or immunoglobulin

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Tetanus in Pregnancy: Vaccine or Immunoglobulin?

The short answer is: both are used, but in different situations. The choice depends on whether you are doing routine prenatal care or managing a wound/injury.

Situation 1: Routine Prenatal Care (No Wound)

What is given: Tdap Vaccine (Active Immunisation)

The Tdap vaccine (Tetanus + reduced Diphtheria + acellular Pertussis) is routinely recommended in every pregnancy, regardless of prior vaccination history or interval since last dose.

Detail	Recommendation
Timing	27-36 weeks of gestation (3rd trimester) - optimal window
Can be given	At any point during pregnancy if needed (e.g., wound)
Dose	0.5 mL intramuscularly
Frequency	Once per pregnancy, every pregnancy

Why every pregnancy?

To maximize the maternal antibody response
To transfer passive antibodies across the placenta to protect the newborn in the first months of life before the infant starts their own vaccine series
If a woman has never received Tdap and couldn't get it during pregnancy, give it immediately postpartum

Immunoglobulin is NOT given routinely in prenatal care. The vaccine is sufficient.

Tintinalli's Emergency Medicine, p. 1978
CDC Tetanus Vaccine Recommendations

Situation 2: Pregnant Woman with a Wound/Injury

Here, the same wound-prophylaxis rules apply as for any patient, but the pregnancy does not change the decision framework - it is based on vaccination history and wound type:

Clean / Minor Wound

Prior Vaccination	Action
< 3 doses or unknown	Vaccine + TIG
≥ 3 doses, last dose < 10 years	Nothing needed
≥ 3 doses, last dose ≥ 10 years	Vaccine booster only

Contaminated / Tetanus-Prone Wound (dirt, soil, feces, bite, puncture, crush, burn)

Prior Vaccination	Action
< 3 doses or unknown	Vaccine + TIG
≥ 3 doses, last dose < 5 years	Nothing needed
≥ 3 doses, last dose ≥ 5 years	Vaccine booster only

If the wound is being addressed before 27 weeks, still give the vaccine - then repeat the Tdap dose at 27-36 weeks of that pregnancy.

Situation 3: Established Tetanus Disease in Pregnancy

If a pregnant woman develops clinical tetanus, she needs both:

TIG (Human Tetanus Immunoglobulin) 500-3,000 IU IM - to neutralize circulating unbound toxin
Tetanus toxoid vaccine - at a separate site, because the disease itself does NOT confer immunity

Additional management includes:

Surgical debridement and uterine evacuation if products of conception are retained (tetanus can follow childbirth/abortion)
IV Penicillin G, diazepam for spasm control, ICU support
Maternal mortality from tetanus in pregnancy exceeds 50%
Creasy & Resnik's Maternal-Fetal Medicine, p. 4130
Goldman-Cecil Medicine, p. 3060-3061

Summary Table

Clinical Scenario	Vaccine (Tdap/TT)	TIG (Immunoglobulin)
Routine prenatal care	YES - 27-36 weeks, every pregnancy	No
Clean wound, well vaccinated	Booster only if > 10 years	No
Dirty wound, < 3 prior doses	YES	YES
Dirty wound, well vaccinated but > 5 years	Booster only	No
Established tetanus disease	YES (at separate site)	YES

Key Points

Tdap in pregnancy is safe - no evidence of harm to the fetus; inactivated vaccine
Immunoglobulin (TIG) is also safe in pregnancy when indicated (passive antibodies, not a live product)
The goal of routine Tdap is protecting the newborn against pertussis and tetanus in early life
Neonatal tetanus (from umbilical cord contamination) is almost entirely preventable by vaccinating the mother

Procedure for it's injection

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