Why should you worry about tetanus when you hurt yourself with something rusty?
In: Biology
Because it’s caused by a bacterium that enters your body in the form of “spores” that ripen to the full (toxin producing) bacterium once they entered your body.
Rusty metal is just a good place to cut yourself on something that can hold a lot of dirt (including these spores). A non-rusty piece of metal is smooth and so spores are washed off by rain easily.
There are many ways to get tetanus into wounds without rusty metal though
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