It is also called lockjaw, because it causes spasms of muscles of the neck and jaw. Tetanus is quite rare today because most people are vaccinated against it. The bacteria that cause tetanus are found in the soil, usually where there is animal manure. Tetanus is most often seen in people who work in an agricultural setting and are exposed to fresh manure and soil. The tetanus bacteria enter the body through a wound that is contaminated with soil or manure.
Puncture wounds place one at high risk.
People with severe burns can also get the infection. The first symptom is usually a stiffening of the muscles in the neck and face that makes it difficult to open and close your mouth. Problems swallowing, rigid or hard abdominal muscles, twitching, fever and sweating can also occur. Symptoms usually begin about eight days after an injury. The more contaminated the wound, the sooner the symptoms may begin.