WebMD Answers
The tetanus vaccine is good for TEN YEARS, but some medical providers will recommend a booster vaccine sooner than that if there is some doubt as to the previous date, or if the wound is particularly prone. The disease, tetanus, is very rare in the United States (not so rare in other countries), but if you should get it, it has an extremely high fatality rate. Getting a vaccine every ten years for 100% protection is really the best deal out there in the vaccine world.
Getting the vaccine 24 hours before a planned injury (?) is unlikely to be very effective, unless of course, you have prior immunity from a previous tetanus still on board.
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