Tetanus is caused by Clostridium tetani, a bacterium whose spores live in soil, dust, and animal waste. The spores get into the body through broken skin, where they can produce a toxin that attacks the nerves controlling your muscles. It is rare in the U.S. because most people are vaccinated, but it is serious when it happens. The good news is that a booster at the right time prevents it. Here are straight answers to the questions people ask most after an injury.
Can You Get Tetanus From Rust?
Rust itself does not cause tetanus. The reason rusty nails have that reputation is that they are usually found outdoors, in soil, barns, and construction sites, where tetanus spores live, and they tend to cause deep puncture wounds. A deep, dirty puncture is exactly the kind of wound tetanus spores thrive in, because the bacteria grow best where there is little oxygen. So the risk comes from the dirt and the depth of the wound, not from the rust.
Can You Get Tetanus From a Scratch?
Yes, although it is much less likely than with a deep wound. Any break in the skin can let spores in, including scratches, scrapes, and even small cuts from gardening. A light scratch from a clean object carries very little risk. A scratch that was contaminated with soil or animal waste, or one from an animal, carries more. What matters most is whether your tetanus shots are up to date.
Can You Get Tetanus From a Wood Splinter or a Thorn?
You can. Splinters and thorns create small puncture wounds and can carry soil and plant material under the skin, which is why gardeners and people doing yard work are among those most often affected. Remove the splinter completely, clean the area with soap and water, and check when your last tetanus shot was. If part of it is stuck deep or the area becomes red, swollen, or painful, have it looked at.
Can You Get Tetanus From Drinking Rusty Water?
No. Tetanus needs a wound to get into the body. Swallowing rusty water does not cause tetanus.
When Do You Need a Tetanus Shot After an Injury?
The CDC’s wound guidance depends on two things: the type of wound and how long it has been since your last dose.
- Clean, minor wounds: a booster is recommended if your last tetanus shot was 10 or more years ago.
- Dirty or major wounds, such as punctures, wounds contaminated with dirt, saliva, or feces, animal bites, burns, crush injuries, and frostbite: a booster is recommended if your last shot was 5 or more years ago.
- Never vaccinated, unsure, or didn’t finish the childhood series: you may need both a vaccine dose and tetanus immune globulin for a dirty or major wound. This is a decision for a clinician, and it is time-sensitive.
If you can’t remember your last tetanus shot, assume it is time to ask. Our page on when you need a tetanus shot covers the routine schedule for adults and children.
What Tetanus Symptoms Look Like
According to the CDC, symptoms usually appear 3 to 21 days after exposure, with an average of about 8 days. The first sign is often cramping or tightness in the jaw muscles, known as lockjaw. Other symptoms include trouble swallowing, muscle stiffness, painful muscle spasms, fever, sweating, and changes in heart rate. Tetanus is a medical emergency. Anyone with these symptoms after a wound needs emergency care right away.
When a Wound Needs the ER
- A deep puncture, such as stepping on a nail, especially through a shoe or outdoors
- A wound with dirt or debris you can’t wash out completely
- An animal or human bite
- A cut that gapes open or keeps bleeding after 10 minutes of firm pressure. See do I need stitches?
- Growing redness, warmth, swelling, pus, or red streaks around the wound
- Any jaw stiffness, trouble swallowing, or muscle spasms in the days after an injury
Get Wound Care and a Tetanus Booster at Sugar Land ER
Sugar Land ER can clean and close wounds, remove foreign objects, and give a tetanus booster in the same visit, 24 hours a day with a strict no-wait policy and board-certified emergency physicians. Learn more about our tetanus risk guidance, check in online, or call (281) 697-5250.
