DefinitionThe Tdap vaccine protects against diphtheria, tetanus, and pertussis (whooping cough). All of these are serious, potentially deadly illnesses caused by bacteria.See also:TetanusDiphtheriaPertussisDTaP immunizationAlternative NamesTdap immunizationInformationTdap is not the same as DTaP. They both protect against the same diseases, but are given at different times. For information on DTaP, see: DTaP immunization.WHO SHOULD GET THIS VACCINETdap is recommended as a booster to the DTaP vaccine in people ages 11 - 64. It is given by a shot (injection), usually into the arm or thigh.Tdap vaccine is recommended for children around ages 11 or 12. Adults ages 19 to 64 should receive a dose of Tdap as a substitute for the Td vaccine once, then have Td for subsequent boosters.If you previou