Study of Menactra® in US Adolescents When Administered Concomitantly With Tdap Vaccine

Inclusion Criteria : * Healthy as determined by medical history and physical examination. * Aged ≥ 11 to 17 years at the time of study vaccination on Day 0. * Informed consent form that has been approved by the Institutional Review Board (IRB) signed by the parent or legal guardian. * Informed assent form that has been approved by the IRB signed by the subject. * Subject (female) agrees to use measures to prevent pregnancy during the study. Exclusion Criteria : * Serious chronic disease (i.e. cardiac, renal, neurologic, metabolic, rheumatologic, psychiatric, etc.). * Known or suspected impairment of immunologic function. * Acute medical illness with or without fever within the last 72 hours or an oral temperature ≥ 100.4°F (≥ 38.0°C) at the time of enrolment. * History of documented invasive meningococcal disease or previous meningococcal vaccination. * History of documented infection with Bordetella pertussis, Clostridium tetani, or Corynebacterium diphtheriae or vaccination with any tetanus, diphtheria or pertussis vaccine within the previous 5 years. * Received either immune globulin or other blood products within the last 3 months; or received injected or oral corticosteroids, or other immunomodulator therapy, within 6 weeks of the study vaccines. Individuals on a tapering dose schedule of oral steroids lasting \<7 days and individuals (e.g., asthmatics) on a short schedule of oral steroids lasting 3 to 4 days may be included in the trial as long as they have not received more than one course within the last 2 weeks prior to enrolment. * Received antibiotic therapy within the 72 hours prior to vaccination on Day 0. * Received any vaccine 28 days prior to the 1st study vaccination or scheduled to receive any vaccination during the course of the study. * Suspected or known hypersensitivity to either of the two study vaccines or their components. * Unavailable for the entire study period, or unable to attend the scheduled visits or to comply with the study procedures. * Enrolled in another clinical trial. * Diagnosed with any condition, which, in the opinion of the investigator, would pose a health risk to the subject or interfere with the evaluation of the vaccine. * For all females, a positive or equivocal urine pregnancy test at time of study vaccination. * Nursing mothers.