Tetanus (also known as lockjaw) is an infection marked by prolonged muscle spasms. The infection is a toxin affects the nervous system. It can be fatal if left untreated.

Nervous System
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Tetanus caused by a specific bacterium found in soil, dust, or manure. It enters your body through a break in the skin.

When it is in your body, the bacteria create a toxin. This toxin causes tetanus.