Study of SP306 Given Intramuscularly Compared to DT Given Subcutaneously in Japanese Adolescents 11 - 12 Years Old

Inclusion Criteria: * Aged 11 or 12 years and considered healthy on the day of inclusion * Informed consent form and assent form signed and dated by the parent(s) / legal representative(s) and the subject respectively * Completed childhood vaccination against diphtheria, pertussis and tetanus (i.e., received 4 doses of Japanese-produced DTaP vaccine), confirmed by checking immunization records and have not yet undergone additional DT vaccination * Able to attend all scheduled visits and to comply with all trial procedures * For female subjects, either pre-menarchal, or post-menarchal with a negative urine pregnancy test. Exclusion Criteria: * Any conditions or diseases which, in the opinion of the Investigator: * would pose a health risk to the subject * or might interfere with the ability to participate fully in the study * or might interfere with evaluation of the vaccine * or would otherwise make participation inappropriate according to the Investigator's clinical judgment * History of diphtheria, tetanus, pertussis, confirmed either clinically, serologically, or microbiologically * Suspected or known hypersensitivity to any of the vaccine components or history of a life threatening reaction to a vaccine containing the same substances of the study vaccine * Vaccination in the last 5 years against tetanus, diphtheria, and/or pertussis * Known or suspected congenital immunodeficiency, or current / previous acquired immunodeficiency, or current / previous receipt of immunosuppressive therapy such as anti-cancer chemotherapy or radiation therapy, or current / previous (within the last 6 months) systemic corticosteroid therapy * Participation in another clinical trial investigating a vaccine, drug, medical device, or medical procedure in the 4 weeks preceding the trial inclusion * Planned participation in another clinical trial during the present trial period * Receipt of blood or blood-derived products in the past 3 months, that might interfere with assessment of the immune response * Receipt of any vaccine within the 4 weeks preceding the trial vaccination, except for influenza vaccination, which may be received at least 2 weeks before the study vaccine * Planned receipt of any vaccine during the trial period * Clinical or known serological evidence of systemic illness including Hepatitis B, Hepatitis C and/or Human Immunodeficiency Virus (HIV) infection * At high risk for diphtheria, tetanus or pertussis infection during the trial * Known pregnancy, or a positive urine pregnancy test * Currently breastfeeding a child * Known thrombocytopenia or history of thrombocytopenia * Bleeding disorder, or receipt of anticoagulants in the 3 weeks preceding inclusion * History of acute disseminated encephalomyelitis, encephalopathy, Guillain-Barré Syndrome (GBS), or autoimmune disease * Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily * Current alcohol abuse or drug addiction that might interfere with the ability to comply with trial procedures * Identified as an employee of an Investigator, a study center, a study-affiliated vendor, or the Sponsor, with direct or indirect involvement in the proposed study or other studies under the direction of that Investigator or study center; or identified as a spouse or child (whether natural or adopted) of such an employee.