Lot-to-lot Consistency Study of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants From 2 Months of Age

Recruiting now · Phase 3

Conditions studied: Pneumococcal Immunization, Healthy Volunteers

In brief

This is a phase 3 randomized, modified double-blind study whose purpose is to measure whether 3 lots of the investigational pneumococcal vaccine PCV21 can help the body to develop germ-fighting agents called "antibodies" (immunogenicity) in a similar way (ie, same immune response) when they are given to infants aged from approximately 2 months (42 to 89 days) and are safe compared to a licensed 20-valent pneumococcal vaccine (20vPCV) (Prevnar 20™). The study duration per participant will be up to approximately 17 months. The study vaccines (either PCV21 or 20vPCV) will be administered at approximately 2, 4, 6 and 12 months of age. Cohort A will include randomization to three PCV21 formulation groups or one 20vPCV comparator group (Group 1-4, approximately 896 total participants), whereas Cohort B will include randomization to three PCV21 formulation groups only (Groups 1-3, approximately 1299 total participants). Routine pediatric vaccines will be given as per local recommendations. There will be 6 study visits: Visit (V)01, V02 separated from V01 by 60 days, V03 separated from V02 by 60 days, V04 separated from V03 by 30 days, V05 at 12 months of age, V06 separated from V05 by 30 days

Key facts

Study ID: NCT07348692
Run by: Sanofi
People needed: 2195
Starts: 2026-01-20
Expected to finish: 2028-05-29
Last updated by the study team: 2026-05-22

Who can join

Age: 0 and older, up to 0. Sex: any. Healthy volunteers: accepted.

You may qualify if…

Aged 42 to 89 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

You may not qualify if…

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 vaccine being administered in the study
History of seizure or significant stable or progressive neurologic 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 substances3
Laboratory-confirmed or known thrombocytopenia, as reported by the parent(s) / legally acceptable representative (LAR(s)), 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.
Receipt of any BCG vaccine within 4 weeks preceding the first study intervention administration or planned receipt any BCG vaccine within the study period
Previous vaccination against Streptococcus pneumoniae
Previous vaccination against the following antigens: diphtheria, tetanus, pertussis, H. influenzae type b, 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.

Where it is running

Northwest Arkansas Pediatric Clinic- Site Number : 8400039 — Fayetteville, Arkansas, United States (enrolling)
Matrix Clinical Research - Huntington Park- Site Number : 8400029 — Huntington Park, California, United States (enrolling)
Community Clinical Research- Site Number : 8400030 — Los Angeles, California, United States (enrolling)
Matrix Clinical Research - Los Angeles- Site Number : 8400028 — Los Angeles, California, United States (enrolling)
PAS Research - Tampa- Site Number : 8400034 — Tampa, Florida, United States (enrolling)
Kentucky Pediatric Research- Site Number : 8400036 — Bardstown, Kentucky, United States (enrolling)
Michigan Institute of Research- Site Number : 8400004 — Allen Park, Michigan, United States (enrolling)
Tribe Clinical Research At Neighbors Pediatrics- Site Number : 8400008 — Charleston, South Carolina, United States (enrolling)
Parkside Pediatrics - Simpsonville- Site Number : 8400005 — Simpsonville, South Carolina, United States (enrolling)
Tribe Clinical Research - Spartanburg- Site Number : 8400026 — Spartanburg, South Carolina, United States (enrolling)
PAS Research - Children's Care Clinic- Site Number : 8400035 — Edinburg, Texas, United States (enrolling)
Pediatric Center - Richmond- Site Number : 8400038 — Richmond, Texas, United States (enrolling)
Rio Clinical Trials - Canyon View- Site Number : 8400031 — Ogden, Utah, United States (enrolling)
Investigational Site Number : 3400001 — San Pedro Sula, Honduras (enrolling)
Investigational Site Number : 3400002 — Tegucigalpa, Honduras (enrolling)
Investigational Site Number : 3400003 — Tegucigalpa, Honduras (enrolling)
Investigational Site Number : 6300005 — Guayama, Puerto Rico (enrolling)
Investigational Site Number : 6300006 — San Juan, Puerto Rico (enrolling)
Investigational Site Number : 6300007 — Trujillo Alto, Puerto Rico (enrolling)

Full record on ClinicalTrials.gov

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