A student who has not received primary immunization for tetanus, diphtheria and pertussis by seven (7) years of age shall receive tetanus, diphtheria (Td)-containing vaccine as follows:
DTP, DT, or DTaP doses administered before age seven (7) may satisfy § 141.1, unless given before the appropriate age or at less than the required minimum interval between doses. If the last dose of DT-containing vaccine was given before four (4) years of age, one additional dose of Td or Tdap shall be administered.
Beginning with the 2008/2009 school year, if the last dose of the primary DT-containing immunization series or booster was administered before age seven (7), a Tdap booster dose shall be administered no sooner than five (5) years after the previous dose at eleven (11) years of age, but no later than the twelfth (12) birthday. If the last dose of the primary DT-containing immunization series or booster was administered on or after age seven (7), a Tdap booster dose shall be administered no earlier than five (5) years and not later than six (6) years after the last DT-containing immunization.
A Td or Tdap-containing booster shall be administered at ten (10) years after the primary series or the last booster and by eleven (11) years of age. Tdap shall be used for one (1) dose beginning with the 2008/2009 school year.
D.C. Mun. Regs. tit. 22, r. 22-B141