The Tdap vaccine is a required immunization for students entering 6th grade. Tdap is the adolescent combination vaccine that protects against Tetanus, Diphtheria and Pertussis (whooping cough). Only one dose is required. Parents need to make sure that their child is immunized with the Tdap vaccine by the 30th day of school in the fall; otherwise, there is the risk of the child being excluded from school. Parents whose children are not up to date will receive a letter from MMSD at the end of 5th grade and then again in the beginning of 6th grade. If you have questions, call 663-8427. Learn more.