Depends: If you can't remember it is likely 10 years since your last shot. If activities like gardening expose you to spores you should consider a booster even sooner. If your life ever brings you in contact with infants, you should consider the tdap which adds coverage for pertussis, which adults can get even if immunized as babies. This would prevent you from passing it to a baby.
Answered 12/10/2013
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