Tetanus (Lockjaw)

Latest News

Tetanus, a disease once considered largely under control through widespread vaccination, is witnessing a resurgence in the United States. Health experts attribute this trend primarily to declining vaccination coverage, especially among adults who have not received their recommended booster doses.

What is Tetanus?

• Tetanus, commonly known as Lockjaw, is a serious bacterial disease that attacks the nervous system, causing severe muscle stiffness and painful spasms.

• The disease is caused by a powerful neurotoxin produced by the bacterium Clostridium tetani.

• Unlike many infectious diseases, tetanus does not spread from person to person. Infection occurs when bacterial spores enter the body through cuts, puncture wounds, burns, animal bites, or contaminated injuries, where they multiply under low-oxygen conditions and release toxins.

Causative Organism

• The disease is caused by Clostridium tetani, a Gram-positive, spore-forming, anaerobic bacterium. The spores are highly resistant and are commonly found in soil, dust, animal manure, and occasionally in the human intestine.

• Because these spores can survive in the environment for many years, tetanus remains a persistent public health concern.

• The disease occurs more frequently in warm climates and during warmer months, when environmental conditions favour bacterial survival.

How Does Tetanus Affect the Body?

• After entering the body through an open wound, the bacteria produce a toxin known as Tetanospasmin, one of the most potent toxins known.

• This toxin travels through the nervous system and blocks the release of inhibitory neurotransmitters, particularly GABA and Glycine, resulting in continuous muscle contractions, rigidity, and painful spasms.

• The incubation period generally ranges from 3 to 21 days, with an average of 8 days. Shorter incubation periods are often associated with more severe disease.

Symptoms

The earliest and most characteristic symptom of tetanus is Lockjaw (Trismus), in which the jaw muscles become stiff, making it difficult or impossible to open the mouth.

As the disease progresses, patients experience difficulty swallowing, painful muscle stiffness, and sudden involuntary muscle spasms, particularly in the abdomen and back. Other symptoms include headache, fever, profuse sweating, seizures, and fluctuations in blood pressure and heart rate due to autonomic nervous system involvement.

Complications

Severe tetanus can result in life-threatening complications. Patients may develop Laryngospasm, in which the vocal cords suddenly tighten, causing airway obstruction and breathing difficulty. Repeated muscle spasms can lead to bone fractures, while prolonged immobility increases the risk of Pulmonary Embolism.

Aspiration of saliva or vomit may cause Aspiration Pneumonia, and respiratory muscle involvement can result in Respiratory Failure, which is the leading cause of death in severe tetanus cases.

Treatment

There is no specific cure for tetanus once the toxin has attached to the nervous system. Treatment focuses on neutralising circulating toxin, controlling muscle spasms, managing complications, and providing intensive supportive care, including mechanical ventilation if required.

Importantly, recovery from tetanus does not provide natural immunity, meaning a person can become infected again if not vaccinated.

Prevention

Tetanus is a completely vaccine-preventable disease. Protection is provided through Tetanus Toxoid-containing vaccines, including DTP, DTaP, Td, and Tdap vaccines.

Routine childhood immunisation consists of five primary doses, followed by booster doses during adolescence and every 10 years throughout adulthood to maintain immunity.

Pregnant women are advised to receive the Tdap vaccine during pregnancy to protect both themselves and their newborns against neonatal tetanus.

Public Health Significance

The widespread use of tetanus vaccination has drastically reduced global mortality. However, the disease remains a concern in areas with low immunisation coverage, poor wound care, and unsafe childbirth practices. Maintaining high vaccination coverage and timely booster doses is essential because tetanus spores remain widespread in the environment and cannot be eradicated.