Tetanus shot and wounds: when you need a booster and what to do

Before you think about the shot, clean the wound well. That lowers the risk the most:

According to the CDC, after finishing the vaccine series, adults need a tetanus and diphtheria booster (Td or Tdap) every 10 years to stay protected. That is the routine schedule, even if you never get hurt.

Protection fades over the years. That’s why, with a higher-risk wound, the booster is moved up: you don’t wait for the 10-year mark.

Someone who never finished the series, or doesn’t know whether they did, isn’t protected in the same way. In those cases the clinician who sees you in person decides whether you need the full series and, depending on the wound, other measures.

The CDC rule for someone who has completed the vaccine series is simple. What changes is how dirty or high-risk the wound is:

Many people think rust causes tetanus. It doesn’t. Tetanus is caused by a bacterium, *Clostridium tetani*, whose spores live in soil, dust and manure and enter through breaks in the skin. A rusty nail is risky because it is usually dirty and makes a deep puncture, where the bacteria grow without oxygen, not because of the rust itself.

After a storm or hurricane, injuries go up: cuts from zinc roofing sheets, glass, nails and branches, and wounds from clearing debris or walking barefoot in mud. If this happened to you, review the health after a hurricane guide. If you were also exposed to floodwater, read about leptospirosis, which is a separate risk from tetanus.

All of these wounds count as dirty: use the 5-year rule. A small cut from a clean object does not.

Animal and human bites are higher-risk wounds, for both tetanus and infection. If it was a mongoose, a bat or an unknown animal, the urgent concern is rabies: read the animal bite guide and go to an ER today.

Foot punctures (such as a nail through a shoe), cuts from garden and farm tools, and wounds contaminated with soil or farm animals also count as higher risk. For cuts and wounds in general, see cuts and wounds.

Tetanus is a serious illness, but it is uncommon where vaccination is high. According to the CDC, symptoms usually start 3 to 21 days after the injury (about 10 days on average), though sometimes later. It does not spread from person to person.

The signs are jaw stiffness ("lockjaw"), neck pain and stiffness, trouble swallowing, painful muscle spasms, a rigid abdomen, fever and sweating. If you have any of these after a wound, go to an emergency room right away or call 911. This is not managed by video.

The key point: tetanus is prevented with the vaccine. Having had tetanus does not make you immune, so people who have had it still need to be vaccinated.

The clinic does not give vaccines. We say it plainly so you don’t lose time. You can get the booster (Td or Tdap) at:

During pregnancy, the CDC recommends one dose of Tdap in every pregnancy, preferably between weeks 27 and 36, to protect the baby from whooping cough. Coordinate it with your obstetrician. If you get a dirty wound while pregnant, ask to be assessed in person.

For children, the vaccine schedule includes the tetanus series starting in the first months of life. If a child gets a dirty wound and isn’t up to date, take them to their child’s doctor or an ER. For the vaccination certificate schools ask for, read the PVAC-3 guide.

By video we do not give the vaccine or treat a deep, puncture or heavily soiled wound: that happens in person. What we can do is help you decide what comes next.

In an online doctor visit, Dr. Diana Nieves Castro, a Puerto Rico–licensed general practice physician with several years of emergency-department experience, can look at your wound on video, ask how it happened and when your last shot was, and tell you clearly whether home care is enough, whether you are due for a booster and where to go, or whether you need an ER today. She can also check for signs of infection in the days after. See the skin infection guide. If appropriate, the doctor prescribes and we send your prescription to your pharmacy.

A doctor visit has the same price for every age, with no membership; your card is charged when you request it, with a full refund if the clinic can’t see you. Video doctor visits 24/7 — book online and choose your time right away. We send you a secure video link that works on your phone, tablet or computer. For patients under 21, a parent or legal guardian stays on camera with photo ID. Book your visit.

Go to an emergency room or urgent care center today, or call 911 for severe bleeding or signs of tetanus. See when to go to the ER.