Changes to the footnote for tetanus, diphtheria, and acellular pertussis (Tdap) and tetanus, diphtheria (Td) vaccines were made to update recommendations. Tdap vaccine is recommended specifically for persons who are close contacts of infants younger than 12 months of age (e.g., parents, grandparents, and child-care providers) and who have not received Tdap previously. Before 2011, vaccination postpartum was preferred for women who had not had a previous adult Tdap dose. However, in 2011, ACIP recommended pregnant women preferentially receive Tdap vaccination during later pregnancy (>20 weeks gestation). Other adults who are close contacts of children younger than 12 months of age continue to be recommended to receive a one-time dose of Tdap vaccine.