Tetanus Boosters Necessary

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Last time I was at my doctor's he said I was overdue for a tetanus shot. I was like wtf I definitely got those as a kid. He said yeah you need a booster every 10 years. So of course I put it off and said next time, but then I left to Germany and now I want to get my ears pierced here.

Read there was a study saying you actually have immunity for 30 years after the childhood course of vaccinations and boosters every 10 years aren't really necessary. What's the truth /sci/?