During an outbreak of a communicable disease for which immunization is required under N.H. Rev. Stat. § 141-C:20-a, children exempted under N.H. Rev. Stat. § 141-C:20-c shall not attend the school or child care agency threatened by the communicable disease. The commissioner shall prepare a written order as required under N.H. Rev. Stat. § 141-C:12, I.