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Tetanus (Lockjaw): Causes, Symptoms, and Vaccination

Tetanus, also known as lockjaw, is a life-threatening infectious disease caused by the bacterium Clostridium tetani, leading to severe and painful muscle spasms.

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Things worth knowing about "Tetanus"

Tetanus, also known as lockjaw, is a life-threatening infectious disease caused by the bacterium Clostridium tetani, leading to severe and painful muscle spasms.

What is Tetanus?

Tetanus, commonly known as lockjaw, is a serious and potentially fatal infectious disease caused by the bacterium Clostridium tetani. This bacterium produces a powerful neurotoxin called tetanospasmin, which attacks the nervous system and causes painful, uncontrollable muscle spasms. While tetanus is found worldwide, it has become rare in developed countries due to widespread vaccination programs.

Causes and Transmission

The spores of Clostridium tetani are naturally present in soil, dust, on plants, and in the digestive tracts of animals and humans. Infection typically occurs through:

Dirty or deep puncture wounds (e.g., from nails, thorns, or barbed wire)
Burns or animal bites
Surgical wounds or chronic ulcers
Umbilical cord wounds in newborns (neonatal tetanus)
Intravenous drug use with non-sterile needles

Tetanus is not contagious -- it does not spread from person to person. The danger lies solely in the toxin tetanospasmin, which travels along nerve pathways to the central nervous system.

Symptoms

The incubation period is typically 3 to 21 days, but can be longer. A shorter incubation period generally indicates a more severe illness. Common symptoms include:

Trismus (lockjaw): Stiffness and inability to open the jaw due to jaw muscle spasms
Risus sardonicus: A fixed, sardonic grin caused by facial muscle spasms
Neck stiffness and difficulty swallowing
Generalized muscle spasms triggered by light, noise, or touch
Opisthotonus: Extreme arching of the back due to back muscle spasms
Respiratory failure due to spasms of the breathing muscles (life-threatening)
Rapid heart rate, blood pressure fluctuations, and excessive sweating

Diagnosis

Tetanus is primarily diagnosed clinically, based on the characteristic symptoms and the patient's medical history. There is no reliable routine laboratory test to confirm tetanus. Key steps in diagnosis include:

Detailed history of wound exposure and vaccination status
Physical examination assessing muscle rigidity and spasms
Exclusion of other conditions such as meningitis, strychnine poisoning, or other causes of muscle spasms
Occasional culture of Clostridium tetani from the wound (not always successful)

Treatment

Tetanus is a medical emergency requiring immediate intensive care. Treatment involves several key approaches:

Wound Management

The entry wound must be thoroughly cleaned and surgically debrided to stop further toxin production.

Antitoxin Administration

Human tetanus immunoglobulin (TIG) is injected intramuscularly to neutralize circulating toxin that has not yet bound to nerve tissue.

Antibiotics

Antibiotics such as metronidazole or penicillin G are used to eliminate bacteria at the wound site and prevent further toxin production.

Symptomatic Therapy

Muscle relaxants and sedatives (e.g., diazepam) to control spasms
Mechanical ventilation in cases of respiratory failure
A quiet, dimly lit environment to minimize stimuli that trigger spasms
Cardiovascular support as needed

Vaccination During Illness

Since recovering from tetanus does not confer lifelong immunity, active immunization should be initiated or updated concurrently with treatment.

Prevention and Vaccination

Tetanus is almost entirely preventable through vaccination. The tetanus vaccine is part of routine immunization schedules recommended by health authorities worldwide:

Primary immunization series in infancy (starting from 2 months of age)
Booster doses during childhood and adolescence
Booster every 10 years in adulthood
Wound-related review and immediate booster if vaccination is not up to date

Vaccination is typically given as a combination vaccine (e.g., against tetanus, diphtheria, and pertussis). The tetanus vaccine is highly effective and is considered one of the most important achievements of modern preventive medicine.

References

World Health Organization (WHO): Tetanus. Available at: https://www.who.int/news-room/fact-sheets/detail/tetanus (accessed 2024)
Centers for Disease Control and Prevention (CDC): Tetanus. Available at: https://www.cdc.gov/tetanus (accessed 2024)
Farrar JJ et al.: Tetanus. In: Harrison's Principles of Internal Medicine, 21st edition, McGraw-Hill, 2022.

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