evidence: If a student did not receive the Tdap in seventh grade and is currently in eighth grade, does he or she need to get a dose of Tdap? Yes. If a student has not received a dose of Tdap and is in seventh or subsequent grades, he or she needs a dose on or before the start of school. This is an example of a single-dose vaccine and is required on the child's first day of attendance for that school year. [...] Yes. The ACIP schedule recommends the Tdap vaccine be given at age 11-12. This is the ideal and preferred age group for administration of the vaccine. We understand there are times when a 10-year-old who is up to date with vaccination may receive the Tdap dose. Therefore, a 10-year-old who is already up-to-date with vaccinations that intentionally receives Tdap due is considered to have received a valid and accepted dose that may be counted as the seventh grade Tdap dose and does not need to have the vaccine repeated at age 11-12.