LITTLE ROCK, Ark. (ADH) – Children who will be 11 years of age or older on or before September 1 of each school year will be required to receive a Tdap shot in order to attend public or private school in Arkansas. This new requirement is anticipated to be effective September 1, 2014. Previously a Tdap shot was required for students entering Grade 7. Only one Tdap is required, so children who have already received the shot will not need another. Students who will be 11 years old on or before September 1 will have until October 1 to meet this new shot requirement.