The Centers for Disease Control and Prevention (CDC) has published a warning (Inadvertent intradermal administration of tetanus toxoid-containing vaccines instead of tuberculosis skin tests ...

The tetanus shot is such a vaccine. Tetanus is a disease caused by toxins created by the bacteria Clostridium tetani. The vaccine conditions the body's immune system to eliminate these toxins.

The tetanus vaccine protects people who may come into contact with the bacteria that cause tetanus. As with any vaccine, the tetanus shot can lead to the possibility of some side effects.