In 2011, the adolescent Tdap immunization program was expanded to include a single life-time dose of Tdap vaccine for adults 19 to 65 years of age who did not receive a Tdap dose in adolescence. Effective December 2014, all adults 19 years of age and older, including those 65 years of age and older, are now eligible to receive a single publicly funded dose of the vaccine, irrespective of receiving a prior dose of Tdap in adolescence. This adult dose of pertussis-containing vaccine replaces one of the Td booster doses, which is given every 10 years.
Adult dose of tetanus, diphtheria and pertussis (Tdap) vaccine: information for adults & caregivers - Public Health Division
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