Rust does not cause tetanus so you cannot get tetanus just from touching rust or from getting cut from something rusty.
The cause of tetanus is actually bacteria that can be on the rusty metal such as a rusty nail, rusty tin, etc.
Then when you get cut by it and if it has the bacteria on it then you get tetanus if you're not vaccinated.
Dirt and rust and the metal is not the cause of tetanus but it's because the soil or metal is contaminated with the bacteria causing the tetanus to happen in a persons body.
That tetanus can then lead to death if not treated.
In rare cases you could get infected with tetanus even with a vaccine.
But as long as you've had a tetanus shot vaccine within 10 years then you are usually pretty safe from getting tetanus.
Tetanus is very deadly if not treated and is caused by bacteria that is in soil or on things such as metal, nails etc.
So if you haven't had a tetanus shot and it's been longer than 10 years then you need a tetanus shot to be safe.
The time it takes for the side effects of a tetanus shot to go away can vary from person to person.
However most side effects after tetanus shots go away within a few days to a week or two.
The most common side effect of a tetanus shot injection is pain at the injection site or in the arm where the tetanus shot was given.
When I had a tetanus shot the pain lasted awhile but it did eventually go away.
Having some pain in your arm after you have a tetanus shot is normal and the arm will hurt for a few days to as long as 4 weeks in some cases.
After a few weeks though the pain should not be as bad and if it is or the pain gets worse then see a doctor about it.
The pain should not last longer than a month but sometimes people have reported that they had pain in their arm for as long as 3 months after the tetanus shot.
The last time I had a tetanus shot which was around 5 years ago now the pain in my arm lasted for 2 weeks before it went away.
So you might have the pain for a few weeks and then again you might have it longer.