How long tetanus shot is good for?

5-10 yrs. The tetanus shot we are use to is generally considered effective for older kids & adults for no less that 5 years in most situations and 10 for some. Infants with immature immune systems start a 6-8wks & are boosted every 2mo for 3 doses then at 12-15 mo for primary protection. Those whose activities(play or work) involve repeated incidental wounds may benefit from a booster after 5 yrs.
5-10 years. Tetanus shots should be repeated in five years for high risk people and in ten years for standard risk people.