Patient did not receive at least one td vaccine or one tdap vaccine between nine years prior to the start of the measurement period and the end of the measurement period; or have history of at least one of the following contraindications any time during or before the measurement period: anaphylaxis due to tdap vaccine, anaphylaxis due to td vaccine or its components; encephalopathy due to tdap or td vaccination (post tetanus vaccination encephalitis, post diphtheria vaccination encephalitis or post pertussis vaccination encephalitis.)