I'm not a medical professional... IIRC, a tetanus shot is good for ten years, so if you had one four years ago, or five or six, you're still protected by it. If you needed one, I suspect nine days after the injury would be too late. If the redness persists or pus is present, it's definitely infected.
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Douglas A. Blackmon is an American writer and a Pulitzer Prize winner. He won the Pulitzer Prize for General Non-Fiction for Slavery by Another Name: The Re-Enslavement of Black Americans from the Civil War to World War II.