This was a dose and formulation ranging study to assess the safety and immunogenicity of SP0173 in healthy adolescents, adults, and older adults in the United States (US).

Primary Objective

• To describe the safety profile of each SP0173 investigational formulation.

Observational Objective:

• To describe the immunogenicity of each SP0173 investigational formulation.

All participants received a single dose of vaccine, and were assessed for immunogenicity at baseline (pre-vaccination) and at 30 days post-vaccination. They were also monitored for safety from day of vaccination up to Day 180 post-vaccination.

Inclusion Criteria:

• Aged 10 to 18 years, 19 to 64 years, or >= 65 years on the day of inclusion.
• Informed consent form had been signed and dated by the participant, or assent form had been signed and dated by the participant and informed consent form had been signed and dated by the parent/guardian
• Participant or participant and parent/guardian able to attend all scheduled visits and to comply with all study procedures.

Exclusion Criteria:

• Participant was pregnant, or lactating, or of childbearing potential, (to be considered of non-childbearing potential, a female must be premenarche or post-menopausal for at least 1 year) surgically sterile, or using an effective method of contraception or abstinence from at least 4 weeks prior to vaccination until at least 4 weeks after vaccination.
• Participation at the time of study enrollment or planned participation during the present study period in another clinical trial investigating a vaccine, drug, medical device, or medical procedure.
• Received any vaccine in the 4 weeks preceding the trial vaccination or planned receipt of any vaccine between Visit 1 and Visit 2.
• Known or suspected receipt of a tetanus toxoid, reduced diphtheria toxoid, and Acellular pertussis (Tdap) vaccine or Tdap-containing vaccine at any point in time, or receipt of a tetanus and diphtheria containing vaccine in the preceding 5 years.
• Receipt of immune globulins, blood or blood-derived products in the past 3 months.
• Known or suspected congenital or acquired immunodeficiency, immunosuppressive therapy such as anti-cancer chemotherapy or radiation therapy within the preceding 6 months, or long-term systemic corticosteroids therapy.
• History of diphtheria, tetanus, or pertussis infection (confirmed either serologically or microbiologically).
• Known or suspected systemic hypersensitivity to any of the vaccine components or history of life-threatening reaction to the study vaccine or a vaccine containing the same substances.
• Laboratory-confirmed / self-reported thrombocytopenia or bleeding disorder contraindicating intramuscular vaccination.
• Bleeding disorder, or receipt of anticoagulants in the 3 weeks preceding inclusion, contraindicating intramuscular vaccination.
• History of encephalopathy (e.g., coma, decreased level of consciousness, or prolonged seizures) not attributable to another identifiable cause within 7 days of administration of a previous dose of diphtheria and tetanus toxoids and pertussis (DTP), or diphtheria and tetanus toxoids and acellular pertussis (DTaP) vaccine.
• Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily.
• Current alcohol abuse or drug addiction.
• Chronic illness that was at a stage where it might interfere with trial conduct or completion.
• Moderate or severe acute illness/infection on the day of vaccination or febrile illness (temperature >= 100.4°F).
• Identified as an Investigator or employee of the Investigator or study center with direct involvement in the proposed study, or identified as an immediate family member (i.e., parent, spouse, natural or adopted child) of the Investigator or employee with direct involvement in the proposed study.

Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org