Yes a tetanus shot can make you sick.
Some people have allergic reactions to the tetanus shots which is normal but not everyone gets sick from the tetanus shot.
Some side effects of a tetanus shot include pain, itching, redness, swelling of the skin at the injection site.
Other side effects that some people experience from a tetanus shot are tiredness, nausea, joint pain, muscle aches and even a mild fever.
Small wounds can cause tetanus as it does not really matter how large or small the wound is.
The bacteria that causes tetanus can enter your body through small scratches, small wounds, large wounds etc.
It's not rust that causes tetanus but instead it's bacteria that causes the tetanus.
You can get tetanus even from clean nails, clean metal etc that is not rusty.
You can get a tetanus infection from a small scratch, a small cut from iron or even stepping on a nail.
Getting tetanus from a small scratch is rare but it can happen.
However if you just had a small then I would likely not worry myself about it because it's very rare to get tetanus from a small scratch.
To get tetanus you usually need to have a deeper cut or step on a nail.
Still it's a good idea to make sure you have up to date tetanus shots done to prevent the rare but deadly tetanus infection that can occur.
You don't always need a tetanus injection after getting cut by iron.
However if you haven't had a tetanus injection within 10 years and you get cut by iron then it's best to get a tetanus vaccine.
Tetanus is a rare but often fatal infection that occurs because of bacteria that the iron or other metal can contain.
Rust does not give you tetanus.
However rust can contain the bacteria that causes tetanus.
So if you get cut by rusty metal or step on a rusty nail the rusty nail or metal can contain the tetanus bacteria which is actually what gives you tetanus.
You can even get tetanus from stepping on a clean nail or getting cut with a clean piece of metal.
However you're more likely to get tetanus when stepping on a rusty nail or cutting yourself with a rusty piece of metal.
To prevent tetanus you should get a tetanus shot every 10 years and if you haven't had a tetanus shot within 10 years and you got cut especially with rusty metal or a rusty nail you need to get a tetanus shot.
Tetanus can be deadly if you're not vaccinated for it and you get it and leave it untreated.