What Is Tetanus and What Causes It?

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Tetanus is a serious bacterial disease that affects your nervous system, leading to painful muscle contractions, particularly of your jaw and neck muscles. Tetanus can interfere with your ability to breathe and can threaten your life. This condition is often called "lockjaw". Spores of the bacteria that cause tetanus are found in soil, dust and animal feces. When they enter a deep flesh wound, spores grow into bacteria that can produce a powerful toxin, tetanospasmin, which impairs the nerves that control your muscles.
I have been poisoned by rusty dust coming from our a/c and heater. What should I do?????? I am not up on my tetnus shots
You do not need to panic. You will not get tetanus. Why? Because inhalation is by no means a way to get tetanus. To get tetanus, you have to have a deep wound where is anaerobic.
Also...rust itself does NOT cause tetanus!  Sometimes an old rusty item ALSO is contaminated with dirt/dried animal feces that contains the tetanus bacterium.  On the other hand, you can get tetanus from a non-rusty thing that is contaminated.  Puncture wounds are most likely to lead to tetanus infection, if the object causing the injury is contaminated, since those wounds are likely to be deep and not exposed to air.
how often do you need tetanus booster
Tetanus, also known as lockjaw, is from a bacteria called Clostridium tetani that are found in soil, dust, and manure. The disease affects the nervous system and leads to muscle spasms. There are three types of vaccines you can consider:

- DTaP (diphtheria, tetanus, and acellular pertussis), which is used for the initial vaccination
- Tdap (tetanus, diphtheria, and acellular pertussis), which is used for boosters
- Td (tetanus and diphtheria), which also is used for boosters

Boosters are what you get after you received the first vaccination series as a kid. Every 10 years, you should get a tetanus booster from your doctor, either the Tdap or the Td.
Adults should get tetanus booster shot every 10 years, because the effects of tetanus vaccine will disappear every 10 years, according to the medical guidance provided by CDC. And conditions differ between children and adults.  Babies and children younger than 7 years old receive DTaP or DT, while older children and adults receive Tdap and Td.