Can somebody plz explain the diff between TT & td

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Posted by usmle2 from IP on April 14, 2012 at 23:58:05:

Can please somebody please explain to me when do you give Td to a person and why do you give tetanus toxoid(TT). I saw a MCQ posted previously by Eureka saying that pt was vaccinated with 3 doses of td 7yrs back and now has a crush injury, the answer was to give td, why not give a TT to this person. Why should you still give the diphteric component to the person. What if the question was the same but his injury was less than 5yrs back would you give him a TT. I'm totally confused. Thanks to all of you who can help me with this.

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