According to Lillegard et al (1999), a new tetanus shot is MOST likely to be indicated any time the following occurs:

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Lillegard , Betcher & Rucker (1999) state that anytime there is broken skin, an individual may need to update his or her tetanus shot. Tetanus shots are typically considered good for 10 years before a new vaccination must be performed. However, according to the Mayo Clinic, it is "usually OK" to have an update if it has been at least 5 years since your last one -or if you can't remember when you had your last tetanus shot - if you suffer a high-risk event, like a deep puncture wound.

According to Lillegard Et Al (1999), a New Tetanus Shot