Immunizations: Tetanus (Lockjaw)

Close up of tetanus bacteria

Tetanus is caused by a toxin from Clostridium tetani bacteria. People also call tetanus lockjaw. That’s because it often causes muscle spasms and tightening of the jaw muscles. The bacteria make a toxin, or poison, in the body. The toxin attacks the nervous system.

Tetanus can be deadly, especially in older people and those who aren’t vaccinated.

A vaccine can prevent tetanus

The best way to prevent tetanus is to get the vaccine!

Learn more about the tetanus vaccine

About tetanus

Just for health care providers

Health care providers must report cases of tetanus.

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Last revised February 4, 2025