In the Practice Guidelines, “ACIP Releases 2012 Immunization Schedule,” (February 1, 2012, page 281) the accompanying 2012 catch-up immunization schedule was clarified by the Centers for Disease Control and Prevention after publication. In Figure 3, the second bulleted item under footnote 9 now reads: “An inadvertent dose of DTaP vaccine administered to children aged 7 through 10 years can count as part of the catch-up series. This dose can count as the adolescent Tdap dose, or the child can later receive a Tdap booster dose at age 11–12 years.” The online version of this handout has been updated.