Recruiting
Phase 3

PCV21 vs. 15vPCV

Sponsor:

Sanofi

Code:

NCT06975878

Conditions

Pneumococcal Immunization

Healthy Volunteers

Eligibility Criteria

Sex: All

Age: 0

Healthy Volunteers: Accepted

Interventions

PCV21 vaccine

Vaxneuvance vaccine

Hexyon vaccine

M-M-RvaxPro vaccine

Varivax vaccine

Study Details

Brief summary:

This study is a Phase 3, randomized, modified double-blind study which aims to measure whether PCV21 vaccine (investigational pneumococcal conjugate vaccine) is safe and can help the body to develop germ-fighting agents called "antibodies" (immunogenicity) compared with 15vPCV (Vaxneuvance, licensed pneumococcal conjugate vaccine) when they are administered with routine pediatric vaccines in infants aged from approximately 2 months (42 to 112 days).

The study duration per participant will be up to approximately 20 months. The study vaccines (either PCV21 or 15-valent pneumococcal vaccines) will be administered at approximately 2, 4, and 11 to 15 months of age or at approximately 2, 3, 4, and 11 to 15 months of age (for preterm infants). Routine pediatric vaccines will be given at the same timepoints, as per local practice / recommendations.

• There will be 5 (for full-term infants) or 6 (for preterm infants) study visits:

  • Full-term infants: Visit (V)01, V02 separated from V01 by 60 days, V03 separated from V02 by 30 days, V04 at 11 months of age until 15 months of age, V05 separated from V04 by 30 days.
  • Preterm infants: Visit (V)01, V02 separated from V01 by 30 days, V03 separated from V02 by 30 days, V04 separated from V03 by 30 days, V05 at 11 months of age until 15 months of age, V06 separated from V05 by 30 days.

Conditions

Pneumococcal Immunization

Healthy Volunteers

Study ID

NCT06975878

Start date

May 22, 2025

Status verified date

Aug, 2025

Completion date

Aug 18, 2027

Anticipated

Primary completion date

Aug 18, 2027

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 0

Healthy Volunteers: Accepted

Inclusion Criteria:

  • Aged 42 to 112 days on the day of inclusion
  • Participants who are healthy as determined by medical evaluation including medical history and physical examination
  • Born at full term of pregnancy (≥ 37 weeks) and with a birth weight ≥ 2.5 kg or born after a gestation period above 28 (> 28 weeks) through 36 weeks with a birth weight ≥ 1.5 kg, and in both cases medically stable as assessed by the investigator

Exclusion Criteria: Participants are excluded from the study if any of the following criteria apply:

  • Known or suspected congenital or acquired immunodeficiency; or receipt of immunosuppressive therapy, such as anti-cancer chemotherapy or radiation therapy; or long-term systemic corticosteroid therapy
  • History of microbiologically confirmed Streptococcus pneumoniae infection or disease
  • Any contraindication to the routine pediatric vaccines being administered in the study
  • History of seizure or significant stable or progressive neurological disorders such as infantile spasms, inflammatory nervous system diseases, encephalopathy, cerebral palsy
  • Known systemic hypersensitivity to any of the study interventions components, or history of a life-threatening reaction to the study interventions used in the study or to a product containing any of the same substances
  • Laboratory-confirmed or known thrombocytopenia, as reported by the parent/legally acceptable representative (LAR), contraindicating intramuscular (IM) injection
  • Bleeding disorder, or receipt of anticoagulants in the 3 weeks preceding inclusion, contraindicating IM injection
  • Chronic illness that, in the opinion of the investigator, is at a stage where it might interfere with study conduct or completion
  • Moderate or severe acute illness/infection (according to investigator judgment) or febrile illness (temperature ≥ 38.0°C \[≥ 100.4°F\]) on the day of study intervention administration. A prospective participant should not be included in the study until the condition has resolved or the febrile event has subsided.
  • Receipt of any vaccine in the 4 weeks preceding the study intervention administration or planned receipt of any vaccine in the 4 weeks following the study intervention administration, except for oral rotavirus vaccine, which may be received anytime during the study including at study visits and for influenza vaccination or meningococcal b vaccine, which may be received at least 14 days before or 14 days after any study vaccination. This exception includes monovalent pandemic influenza vaccines and multivalent influenza vaccines, as applicable per local recommendations.
  • Previous vaccination against S. pneumoniae
  • Previous vaccination against the following antigens: diphtheria, tetanus, pertussis, Haemophilus influenzae type b, and poliovirus
  • Receipt of more than 1 dose of hepatitis B vaccine
  • Receipt of immune globulins, blood or blood-derived products since birth
  • Participation at the time of study enrollment (or in the 6 weeks preceding the first study intervention administration) or planned participation during the present study period in another clinical study investigating a vaccine, drug, medical device, or medical procedure

Note: The above information is not intended to contain all considerations relevant to a potential participation in a clinical trial.

Study Design

Enrollment

1080 participants

Anticipated

Allocation

Randomized

Intervention Model

Parallel Assignment

Primary purpose

Prevention

Interventions and Outcome Measures

Arms

experimental: Group 1: PCV21

Participants will be administered via intramuscular injection (IM) a 2-dose primary series of PCV21 at approximately 2 and 4 months of age (MoA) or a 3-dose primary series (preterm infants) at 2, 3, and 4 MoA co- administered with Hexyon. At 11 to 15 MoA, participants will receive a 3rd dose or 4th dose (for preterm infants) of PCV21 co-administered with Hexyon and M M RvaxPro; Varivax will also be co-administered unless not possible as per local practice

active comparator: Group 2: 15vPCV

Participants will be administered via intramuscular injection (IM) a 2-dose primary series of 15vPCV at approximately 2 and 4 months of age (MoA) or a 3-dose primary series (preterm infants) at 2, 3, and 4 MoA co- administered with Hexyon. At 11 to 15 MoA, participants will receive a 3rd dose or 4th dose (for preterm infants) of 15vPCV co-administered with Hexyon and M M RvaxPro; Varivax will also be co-administered unless not possible as per local practice

Interventions

PCV21 vaccine

Pharmaceutical form:Suspension for injection-Route of administration:Intramuscular

Vaxneuvance vaccine

Pharmaceutical form:Suspension for injection-Route of administration:Intramuscular

Hexyon vaccine

Pharmaceutical form:Suspension for injection-Route of administration:Intramuscular

M-M-RvaxPro vaccine

Pharmaceutical form:Powder and solvent for suspension for injection-Route of administration:Intramuscular or Subcutaneous

Varivax vaccine

Pharmaceutical form:Powder and solvent for suspension for injection-Route of administration:Intramuscular or Subcutaneous

Primary outcome measure

  • Seroresponse rate for PCV21 and 15vPCV serotypes [ Time Frame: 30 days post-toddler dose ]
  • IgG concentration for PCV21 and 15vPCV serotypes [ Time Frame: 30 days post-toddler dose ]

Central Contacts and Locations

Central contacts

Trial Transparency email recommended (Toll free for US & Canada)

800-633-1610contact-us@sanofi.com

Locations

Investigational Site Number : 2460001

Recruiting

Houston, Texas, United States, 77030

More Information

Sponsor

Sanofi

Last update posted

Aug 20, 2025

Last verified

Aug, 2025

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-08. This information was provided to ClinicalTrials.gov by Sanofi on 2025-08-20.