Ask the Experts about Diphtheria Vaccines (DTaP, Tdap, DT) - CDC experts answer Q&As

Ask the Experts about Diphtheria Vaccines (DTaP, Tdap, DT) - CDC experts answer Q&As:

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Should further doses of pertussis vaccine be given to an infant or child who has had culture-proven pertussis?

Immunity to pertussis following infection is not lifelong. (What?) Persons with a history of pertussis should continue to receive pertussis-containing vaccines according to the recommended schedule. (Note: This answer is based upon recommendations of the AAP's Committee on Infectious Diseases.) (So, how would a vaccine work, then?)