 [ Symptoms ] how to determine if you are still growing or not  am 21 and wants to find out if am still growing so i can get taller i want to find out whether am a candidate for hgh [ Disease ] most people in the united states have been immunized against tetanus lockjaw if you have been immunized you will need a booster shot if you have not had one within 10 years if it is a very dirty wound or occurs in a tetanus prone area you need a booster within five years if you have never had a tetanus shot or if your series is incomplete fewer than three shots you might need tetanus immunoglobulin a medication that can prevent lockjaw