Usually found in dirt and soil, tetanus bacteria typically enter the body through a wound. Wounds may include a bite, a cut, a puncture, a burn, a scrape, insect bites, or any injury that may cause broken skin. Tetanus can also happen with other infections, like dental infections. It can happen during a surgery or pregnancy and delivery.

A wound can be so small, you may not notice you have one. Or a skin blister could break and become an open wound. If there is any delay in finding or cleaning a wound, there is an increased risk for skin infection and a chance for tetanus to get in the wound. A tetanus infection can start 3 to 21 days after the bacteria enter the wound. Be especially careful about wounds on your fingers and toes.

Many people may not know when they got their last tetanus shot. So it's a good idea to call your doctor to see if you need one.

Make sure to stay up to date on your tetanus shots. A tetanus shot is recommended:

• For a dirty wound that has things like dirt, saliva, or feces in it, if you haven't had a tetanus shot in the past 5 years.
• For a clean wound, if you haven't had a tetanus shot in the past 10 years.