If you got rust in a scratch that didnt bleed can u get tetanus? if so how long does it take to show symptoms? no booster since childhood

Don't worry: You can still get tetanus but chances are very low; recommendation is to have tetanus booster every 10 years with this minor wounds. You are due for your booster anyways so better you get it regardless of that rust in a scratch wound.

My thoughts...: Just go get a tetanus booster tomorrow either at urgent care or at your regular doctor's office. You need one anyway, so just get it done.