Why Your Tetanus Shot Matters More Than You Think

We’ve all heard the classic warning: “Don’t step on that rusty nail or you’ll get tetanus!”

While rust gets all the blame, the truth is a little different and a lot more interesting. Tetanus doesn’t actually come from rust itself; it comes from microscopic bacterial spores (Clostridium tetani) that live chilling out in everyday soil, dust, and animal manure. The rust is just a sign that an object has been sitting outside in the dirt for a long time.

So whether it's a deep puncture from a garden tool, a cat scratch, or a scraped knee on a dusty trail, those tiny spores can find their way into our bodies through broken skin. Once those dormant bacterial spores get trapped in a dark, low-oxygen wound, they wake up and multiply releasing neurotoxins into the body  this impales the nerves controlling muscle function causing muscle pain, most noticeable symptom starting in the jaw “ lockjaw”. Tetanus does not spread from person to person once infected, but you do have to take preventative measures such as up to date vaccinations and proper wound hygiene.

Now how does tetanus affect more then just our jaw you might ask, well when you move your body, your nervous system coordinates with it. when you flex you bicep, your brain sends a singal telling your bicep to relax, when tetanus takesover the Tetanospasmin ( the neurotoxin) goes up your nerve pathway and into the nervous system blocking any signaling without the signaling going to your bicep it wont know to relax, causing painful spasms.

Now don't get scared Tetanus is not like the cold or flu meaning its not contagious person to person but it's entirely triggered by an environment encounter. Getting vaccinated prevents all of the unwanted lockjaw and spores getting into your body and effectively taking over. Most of us got a series of shots as kids (like DTaP). As adults, we need a booster (Td or Tdap) every 10 years to keep our immune system in check. 

Sources: 

Centers for Disease Control and Prevention. (2026, September 8). About tetanus. U.S. Department of Health & Human Services. https://www.cdc.gov/tetanus/about/index.html

Mayo Clinic Staff. (2023, December 21). Tetanus: Symptoms & causes. Mayo Foundation for Medical Education and Research. https://www.mayoclinic.org/diseases-conditions/tetanus/symptoms-causes/syc-20351625