evidence: DTaP is a vaccine that helps children younger than age 7 develop immunity against three deadly diseases caused by bacteria: diphtheria, tetanus, and whooping cough (pertussis). [...] The DTaP vaccine is a vaccination that prevents infections from diphtheria, tetanus, and pertussis (whooping cough). It's given to children younger than age 7. As the immunity wears off, the Tdap shot is recommended and given to adolescents at age 11 and is recommended in adults every 10 years (or after 5 years if there is an instance of a dirty wound or burn). The risk of serious side effects from the vaccination is extremely small. [...] DTaP is a vaccine that helps children younger than age 7 develop immunity to diphtheria, tetanus, and whooping cough (pertussis).