... Hey jriegel, Like kehorner said, TB injections and tetanus (DT booster) are two separate things. The TB subdermal injections are (for some) an annual test to see if your body has a reaction to the material injected (the results tell whether providers need to test more for or treat tuberculosis). The tetanus injection (original injection in childhood is DPT, aka "DiPTet";... (3 replies)