what is tdap shot?
Many people may wonder, What is Tdap?. Tdap (Adacel Â® , Boostrix Â®) is a booster vaccine used to help prevent diphtheria, tetanus, and pertussis (whooping cough) in both adults and adolescents. It is given as a single, one-time injection into the deltoid muscle of the upper arm (where most immunizations are given).