A Trial to Evaluate the Safety and Immunogenicity of ADACEL® Vaccine in Persons 65 Years of Age and Older

Inclusion Criteria : * Ambulatory and not institutionalized. * At least 65 years of age at the time of vaccination. * Signed Institutional Review Board (IRB)-approved informed consent form. * Able to attend all scheduled visits and to comply with all trial procedures. Exclusion Criteria : * Any condition which, in the opinion of the investigator, would pose a health risk to the participant or interfere with the evaluation of the vaccine. * Serious chronic disease (eg, cardiac, renal, neurologic, metabolic, rheumatologic, psychiatric) that is unstable or that, in the opinion of the investigator, might: * interfere with the ability to participate fully in the study; or * interfere with evaluation of the vaccine. * Known or suspected impairment of immunologic function, including use of immune suppressive medications (eg, rheumatoid arthritis drugs such as methotrexate; cancer chemotherapy agents such as vincristine). * Febrile illness within the last 72 hours or an oral temperature ≥ 100.4°F (≥ 38°C) at the time of inclusion. * Any history of documented tetanus, diphtheria or pertussis disease. * Known or suspected receipt of a tetanus, diphtheria or acellular pertussis containing vaccine within the preceding 5 years. * Administration of immune globulin or other blood products within the last three months, or systemic corticosteroid therapy (prednisone or equivalent) for more than 2 consecutive weeks within the past 6 months. * Systemic antibiotic therapy within the 72 hours prior to enrollment. * Received any vaccine, other than influenza vaccine, in the 30-day period prior to enrollment or scheduled to receive any vaccine, other than influenza vaccine, in the 35-day period after enrollment. For influenza vaccine only, defer if received in the 14-day period prior to enrollment or scheduled to receive in the 14-day period after enrollment. * Suspected or known hypersensitivity to any of the vaccine components. * Participation in another interventional clinical trial in the 4 weeks preceding enrollment or planning to participate in another interventional clinical trial during the planned period of this study. * Use of alcohol or drugs in a manner that may, in the opinion of the investigator, interfere with the subject's ability to comply with trial visits or procedures. * Thrombocytopenia or bleeding disorder contraindicating intramuscular vaccination. * Subject deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized without his/her consent, or requires a legally authorized representative.