My Grandfather was a baker and owned a bakery. He cut his finger and didn't go to the hospital for a tetanus shot. Died five days later. The knife wasn't rusty but no matter.
A fellow I used to go fishing with cut himself bad, didn't phase him at all.
Quite a few years ago, he started feeling like crap. Went to the doc, doc gave him some antibiotics and sent him home.
About two days later, my buddy is in the emergency ward, they promptly admitted him. Nobody could figure out what it was.
Some doc was visiting from South Korea and looks into my friends room, and starts screaming in Korean.
TETANUS!!
My friend recovered and has lifelong immunity.
Never found out exactly how he got it, either. He might have inhaled it.