Is there anything written that says you can give Tdap at a shorter than 5-year interval in the case of an outbreak?
Yes. “Vaccine providers can administer Tdap to adolescents aged 11–18 years at an interval less than 5 years after Td, particularly when the benefit of providing protection against pertussis is likely to be increased. The safety of an interval as short as approximately 2 years between Td and Tdap is supported by a Canadian study among children and adolescents (see Spacing and Sequence Administration of Vaccines Containing Tetanus Toxoid, Diphtheria Toxoid, and Pertussis Antigens). . .” (Adolescent Recommendations: http://www.cdc.gov/mmwr/PDF/rr/rr5503.pdf). “Tdap may be given at an interval shorter than 10 years since receipt of the last dose of tetanus toxoid-containing vaccine to protect against pertussis. The safety of an interval as short as approximately 2 years between administration of Td and Tdap is supported by a Canadian study of children and adolescents. The dose of Tdap replaces the next scheduled booster dose of Td.” (Provisional Adult Recommendations: http://www.cdc.gov/n
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