The transmission of tetanus to humans is when a skin wound comes in contact with:

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Tetanus is caused by the bacterium Clostridium tetani, which is commonly found in soil, dust, and animal feces. When a person gets a wound, these bacteria can enter the body through the break in the skin and produce a toxin that leads to tetanus. Rusty nails are often mistakenly associated with tetanus, but the rust itself does not cause tetanus; rather, it's the conditions where rusty objects are found (often outdoors, in environments that may be contaminated with C. tetani from soil or feces) that pose a risk. Tetanus is not transmitted through insect bites or the saliva of infected animals.

The Transmission of Tetanus to Humans Is When a Skin