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Can you tell me what you scraped your finger on?
Do you know how long it has been since your last tetanus shot?
It is best to have a tetanus shot within twentu-four hours of possible contamination with the object, so it would be best to be seen within that time and wait no longer then 48 hours.
If the wire wasn't rusty your chances of getting tetanus is pretty slim but you still need to get the shot.