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The incidence of pertussis has risen dramatically in recent years in the U.S., reflecting in part the relatively weak immunogenicity of the acellular pertussis vaccine introduced in 1996 compared with the whole-cell pertussis vaccines used before 1996. To compensate for this reduced immunogenicity, the Advisory Committee on Immunization Practices (ACIP) broadened the guidelines for tetanus toxoid, diphtheria toxoid, and acellular pertussis (Tdap) vaccination with a new recommendation to provide a booster for all adults and adolescents (JW Pediatr Adolesc Med Jul 25 2005). However, because uptake has been poor, the booster has not lowered pertussis incidence or prevented serious disease in neonates. In 2011, the ACIP recommended Tdap vaccina…