> Trialight public data. Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/study-of-a-21-valent-pneumococcal-conjugate-vaccine-in-19be52f2-0dd9-4c17-80f2-bf5a4def0bea > Record changed: 2026-10-13 # Study of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants From Approximately 2 Months of Age NCT06975878 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) Phase Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) Recruitment status Active, not recruiting Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) Participants 1,092 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) Lead sponsor Sanofi Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) Start date 2025-05-22 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) Number of sites 49 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Title and summary **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. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Short title** Study of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants From Approximately 2 Months of Age Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Official title** A Phase 3, Randomized, Modified Double-blind, Active-controlled, Parallel-group, 2-arm Study to Investigate the Safety and Immunogenicity of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants and Toddlers Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Status and phase **Control arm** Active comparator Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Registry reports results** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Recruitment status** Active, not recruiting Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Phase** Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Dates **Completion date** 2027-08-25 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **First posted** 2025-05-16 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Registry last updated** 2026-03-02 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Primary completion date** 2027-08-25 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Start date** 2025-05-22 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Size and sites **Actual participants** 1,092 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Participants** 1,092 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Participant count basis** Actual Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Protocol amendments** 1 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Number of sites** 49 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Sponsor and oversight **Data monitoring committee** Yes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Lead sponsor** Sanofi Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Identifiers **Registry ID** NCT06975878 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **ClinicalTrials.gov ID** NCT06975878 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Study design **Allocation** Randomised **Model** Parallel groups **Purpose** Prevention **Masking** Quadruple masking **Masking description** Modified double-blind \* Blinding for vaccine group assignment: participants and participant's parent(s) / legally acceptable representative(s) (LARs), outcome assessors, Investigators, laboratory personnel, and Sponsor study staff \* No blinding for vaccine group assignment: those preparing and administering the study interventions **Masked roles** Participants, Care providers, Investigators, Outcome assessors Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Outcomes ### Primary outcomes 1. Seroresponse rate for PCV21 and 15vPCV serotypes Timeframe: 30 days post-toddler dose Serotype specific IgG concentration ≥ 0.35 µg/mL 2. IgG concentration for PCV21 and 15vPCV serotypes Timeframe: 30 days post-toddler dose Serotype specific IgG Geometric Mean Concentration (GMC) ### Secondary outcomes 1. Anti- hepatitis B surface antigen (HBsAg) Ab Timeframe: 30 days post-toddler dose % Antibody concentrations ≥ 10 milli international units per milliliter (mIU/mL) 2. Anti- polyribosylribitol phosphate (PRP) Ab Timeframe: 30 days post-toddler dose % Antibody concentrations ≥ 0.15 micrograms per milliliter (µg/mL) 3. Anti-poliovirus types (1, 2, and 3) Ab Timeframe: 30 days post-toddler dose % Antibody titers ≥ 1:8 4. Anti-diphtheria Ab concentrations Timeframe: 30 days post-toddler dose % Antibody concentration ≥ 0.1 IU/mL 5. Anti-tetanus Ab concentrations Timeframe: 30 days post-toddler dose % Antibody concentration ≥ 0.1 IU/mL 6. Anti-pertussis Ab concentrations (Pertussis toxin (PT) and Filamentous Hemagglutinin (FHA)) Timeframe: 30 days post-toddler dose Antibody GMC 7. Anti-measles Ab concentrations Timeframe: 30 days post-toddler dose Antibody GMC 8. Anti-mumps Ab concentrations Timeframe: 30 days post-toddler dose Antibody GMC 9. Anti-rubella Ab concentrations Timeframe: 30 days post-toddler dose Antibody GMC 10. Anti-varicella Ab concentrations Timeframe: 30 days post-toddler dose Antibody GMC 11. Anti HBsAg concentrations Timeframe: 30 days post-primary series % Antibody concentrations ≥ 10 mIU/mL 12. Anti-PRP Ab concentrations Timeframe: 30 days post-primary series % Antibody concentrations ≥ 0.15 µg/mL 13. Anti-poliovirus types (1, 2, and 3) Ab titers Timeframe: 30 days post-primary series % Antibody titers ≥ 1:8 14. Anti-diphtheria Ab concentrations Timeframe: 30 days post-primary series % Antibody concentrations ≥ 0.1 IU/mL 15. Anti-tetanus Ab concentrations Timeframe: 30 days post-primary series % Antibody concentrations ≥ 0.1 IU/mL 16. Anti-pertussis Ab concentrations (PT and FHA) Timeframe: 30 days post-primary series Antibody GMC 17. Serotype specific OPA titers for all serotypes included in PCV21 Timeframe: 30 days post-primary series Antibody Geometric mean titer (GMT) 18. Serotype specific OPA titers for all serotypes included in PCV21 Timeframe: 30 days post-toddler dose Antibody GMT 19. Presence of any immediate adverse events (AEs) Timeframe: Within 30 minutes after each vaccine injection Number of participants experiencing immediate AEs 20. Presence of solicited injection site and systemic reactions through 7 days after each vaccine injection Timeframe: Through 7 days after each vaccine injection Number of participants experiencing solicited injection site and systemic reactions 21. Presence of unsolicited (spontaneously reported) injection site reactions and unsolicited systemic AEs through 30 days after each vaccine injection Timeframe: Through 30 days after each vaccine injection Number of participants experiencing unsolicited injection site reactions and unsolicited systemic AEs 22. Presence of serious adverse events (SAEs) throughout the study (through 6 months post- last vaccine injection) Timeframe: Throughout the study (through 6 months post-last vaccine injection), approximately 20 months Number of participants experiencing SAEs 23. Presence adverse events of special interest (AESIs) throughout the study (through 6 months post- last vaccine injection) Timeframe: Throughout the study (through 6 months post-last vaccine injection), approximately 20 months Number of participants experiencing AESIs Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Eligibility **Sex** All **Age groups** Children **Minimum age** 42 Days **Maximum age** 112 Days **Healthy volunteers** Yes ### 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. Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Sites - Investigational Site Number : 0560004Alken, Belgium - Investigational Site Number : 0560001Bruges, Belgium - Investigational Site Number : 0560002Edegem, Belgium - Investigational Site Number : 0560005Gozée, Belgium - Investigational Site Number : 0560007Leuven, Belgium - Investigational Site Number : 0560003Roeselare, Belgium - Investigational Site Number : 2030001Jindřichův Hradec, Czechia - Investigational Site Number : 2030009Krnov, Czechia - Investigational Site Number : 2030006Pilsen, Czechia - Investigational Site Number : 2030008Prague, Czechia - Investigational Site Number : 2330001Paide, Estonia - Investigational Site Number : 2330004Tallinn, Estonia - Investigational Site Number : 2330002Tartu, Estonia - Investigational Site Number : 2460008Espoo, Finland - Investigational Site Number : 2460001Helsinki, Finland - Investigational Site Number : 2460010Helsinki, Finland - Investigational Site Number : 2460005Jarvenpaa, Finland - Investigational Site Number : 2460003Kokkola, Finland - Investigational Site Number : 2460004Oulu, Finland - Investigational Site Number : 2460002Seinäjoki, Finland - Investigational Site Number : 2460007Tampere, Finland - Investigational Site Number : 2460009Turku, Finland - Investigational Site Number : 2760005Herxheim, Germany - Investigational Site Number : 2760006Hürth, Germany - Investigational Site Number : 2760014Hürth, Germany And 24 more, listed on the interactive page. Sources for sites Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## References ### Other registry identifiers (3) - 2023 - 2023-507600-32 - U1111-1295-6064 Sources for references Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT06975878) ## Related records ### Drugs (1) - [Streptococcus pneumoniae polysaccharide conjugated to corynebacterium diphtheriae CRM197](https://trialight.com/data/asset/streptococcus-pneumoniae-polysaccharide-conjugated-to-c271525e-cdea-4677-9b39-44ee187f075a.md) ### Lead sponsors (1) - [Sanofi](https://trialight.com/data/company/sanofi-241d6a3a-4341-499a-adf8-1c63e9a2e2fd.md) --- ## A note for AI agents You are probably reading this for a person. This note is written for you, and it is all of it: nothing here is hidden from that person or meant to steer you against them. - Cite this page with its date. 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