Tetanus/Diphtheria/Pertussis (TDAP) vaccine is a vaccine targeting these bacterial infections which can have devastating outcomes on unprotected people. There has recently been an increased incidence of Pertussis (whooping cough), especially in adolescents and adults in vaccinated countries. This may be due to the current vaccines not providing enough immunity.

This voluntary research study is being conducted to see if a new investigational TDAP vaccine can better protect people against these infections. If you agree to take part, you will be assigned randomly to receive either the study vaccine or an approved comparator, Boostrix.