Tetanus: What It Is, Symptoms and Causes, Immunisation, and First Aid
Table of Contents
Tetanus is caused by the kinds of small wounds that most people wouldn’t think twice about. Its causes are common and a part of everyday life, and the wounds that carry risk are not always the ones that draw attention.
What Is Tetanus?
Tetanus is a life-threatening bacterial infection. Once inside the body, the bacteria produce a powerful toxin that travels through your nervous system and disrupts the signals sent to your muscles. The result is involuntary muscle stiffness and painful, uncontrollable spasms.
Your jaw muscles are the first to be affected in most cases, which is why tetanus is widely known as “lockjaw.” The infection can progress to affect muscles throughout the body, including those used for breathing, making it one of the more severe bacterial infections a person can develop.
What Causes Tetanus
Not all wounds carry the same level of tetanus risk. Certain wound types are more likely to allow the bacteria to grow:
- Puncture wounds from nails, thorns, needles, or splinters
- Wounds contaminated with soil, dust, or animal manure
- Animal or human bites
- Burns
- Broken bones that pierce the skin
- Skin punctures from injecting drugs
Signs and Symptoms of Tetanus
Tetanus symptoms can appear anywhere from 1 day to several months after exposure, though most cases present within 14 to 21 days. The sooner symptoms appear after exposure, the more severe the infection tends to be. Tetanus symptoms usually include:
Early symptoms
Stiffness in your jaw muscles is the first sign in most cases. This can progress to difficulty opening your mouth, swallowing, or speaking. Stiffness in your neck, shoulders, and back may follow.
As the infection progresses
Painful muscle spasms develop and can spread to any muscle in your body. Generalised tetanus, the most common form of the disease, produces spasms across the whole body that can be triggered by minor stimuli such as loud noise, bright light, or touch. Each spasm can last several minutes.
Additional symptoms include fever, sweating, rapid heart rate, and elevated blood pressure.
Complications of Tetanus
The tetanus toxin can cause serious complications beyond the spasms themselves, particularly when the infection is severe or treatment is delayed.
Respiratory failure
The most dangerous complication occurs when muscle spasms affect the muscles used for breathing. This requires mechanical ventilation and care in an intensive care unit.
Cardiovascular complications
Tetanus can affect the systems that regulate your heartbeat and blood pressure, causing irregular heart rhythms and dangerous spikes or drops in pressure.
Other complications
Additional complications include pneumonia, muscle tears, and blood clots in the legs.
Prevention of Tetanus: Vaccine and Immunisation
A dose of tetanus vaccination provides the most reliable way to prevent tetanus. The tetanus antitoxin vaccine contains a modified, harmless version of the toxin that prompts your immune system to produce antibodies against it. If you are later exposed to the bacteria, your body can neutralise the toxin before it causes damage. This protection is strong but fades over time, which is why tetanus booster doses are required throughout life.
The vaccination schedule begins with doses at 2 months, 4 months, 6 months, 18 months, and 4 years of age, with a booster recommended between 12 and 13 years of age. For most people, no further booster is needed until age 50, and again at age 65 if more than 10 years have passed since the last dose.
You may need a booster earlier than scheduled if you are travelling to countries where healthcare access is limited, or if you receive a tetanus-prone wound and your last dose was more than 5 years ago.
First Aid Treatment for Tetanus
First aid addresses the wound that could lead to tetanus. Once symptoms develop, the only way to deal with tetanus is with professional help from a doctor. For any wound that carries a tetanus risk:
- Immediately rinse the wound under clean running water for several minutes to flush out contaminants.
- Gently wipe away any visible, loose dirt with a clean cloth or gauze.
- Lightly spray or dab antiseptic on the wound.
- Cover your wound with a clean dressing then secure it firmly in place with a bandage.
Your doctor can check your vaccination history through the Australian Immunisation Register and advise whether a booster or tetanus immunoglobulin is needed.
Learn the First Aid Response to Tetanus
Tetanus is preventable, and your response to a wound is where that prevention is either secured or lost. Wound management is the part of that response you can deliver before a doctor is involved. First aid training covers practical wound care, giving you a concrete skill set for the moments immediately after any injury.
FAQs
Who Is Most at Risk of Tetanus?
In Australia, those over 65 years old made up 63% of tetanus notifications and all recorded deaths between 2003 and 2019, with most deaths occurring in people over 70 who had never been vaccinated or had not had a booster in over a decade. People who work regularly with soil, animals, or animal waste face higher exposure to the bacteria that cause the infection.
How Is Tetanus Diagnosed?
Tetanus is diagnosed based on a physical examination of your systems. There are no reliable laboratory or medical tests doctors can run to diagnose tetanus cases.
Does the Tetanus Vaccine Have Side Effects?
Like most vaccines, there can be side effects. The most common side effect after a tetanus vaccine is soreness, redness, or swelling at the injection site, which resolves within 48 hours in most cases.
