Pneumococcal ImmunizationPhase 3NCT06824194
Study of the Safety of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants From Approximately 2 Months of Age
A Phase 3 study testing PCV21 vaccine, Prevnar 20 vaccine and M-M-R II vaccine in people with Pneumococcal Immunization, run by Sanofi at 132 sites in 6 countries.
Trial summary
This study is a Phase 3, randomized, modified double-blind study which aims to document the safety profile of the PCV21 vaccine (investigational pneumococcal vaccine) compared to a licensed 20-valent pneumococcal conjugate vaccine in infants aged from approximately 2 months (42 to 89 days). Read more about this study
- Who is it for?
- Ages 42 to 89 daysHealthy volunteers can take part
- Conditions the study is for
- Pneumococcal Immunization
- What is being tested?
- PCV21 vaccine, Prevnar 20 vaccine and M-M-R II vaccine
- Type of treatment
- Vaccines, Pill or oral medicine, Injection or infusion
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 2,360 participants
- Where
- 132 sitesin 6 countries
- Study dates
- 18 Feb 2025to 22 Oct 2027
- Phase
- Phase 3
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 42 to 89 days
- All sexes
- Healthy volunteers accepted
- Child
Who may be able to join
- 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 as assessed by the investigator
Who cannot join
- 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 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 substances
Show all 18Show fewer
- Laboratory-confirmed or known thrombocytopenia, as reported by the parent(s) / legal 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. A prospective participant should not be included in the study until the condition has resolved or the febrile event has subsided
- Receipt of any non-US Food and Drug Administration (FDA) approved vaccine in the 4 weeks preceding the study intervention administration or planned receipt of any non-US FDA approved vaccine in the 4 weeks following the study intervention administration, including monovalent pandemic influenza vaccines and multivalent influenza vaccines, as applicable per local recommendations.
- Receipt of any Bacillus of Calmette and Guerin (BCG) vaccine within 4 weeks preceding the first study intervention administration or planned receipt any BCG vaccine within the study period
- Previous vaccination against S. 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.
Trial locations and contacts
132 sites in 6 countries.
132 sites in 6 countries
United States103 sites
Michigan Institute of Research- Site Number : 8400131
Allen Park, Michigan, 48101
Morehouse School of Medicine - Atlanta- Site Number : 8400093
Atlanta, Georgia, 30310
Austin Regional Clinic - ARC Four Points- Site Number : 8400082
Austin, Texas, 78726
Kentucky Pediatric Research- Site Number : 8400014
Bardstown, Kentucky, 40004
Alabama Clinical Therapeutics - Birmingham - St. Vincent's Drive- Site Number : 8400013
Birmingham, Alabama, 35205
University of Alabama at Birmingham- Site Number : 8400130
Birmingham, Alabama, 35233
Bingham Memorial Hospital - Blackfoot- Site Number : 8400114
Blackfoot, Idaho, 83221
Elite Clinical Trials - Blackfoot- Site Number : 8400017
Blackfoot, Idaho, 83221
SUNY Downstate Medical Center- Site Number : 8400039
Brooklyn, New York, 11203
Neighbors Pediatrics- Site Number : 8400068
Charleston, South Carolina, 29407
Atrium Health - Myers Park- Site Number : 8400080
Charlotte, North Carolina, 28207
Atrium Health - STRIVE Vaccine Research Clinic- Site Number : 8400060
Charlotte, North Carolina, 28207
Eagle Clinical Research- Site Number : 8400087
Chicago, Illinois, 60621
University of Chicago Medical Center- Site Number : 8400062
Chicago, Illinois, 60637
Haywood Pediatric and Adolescent Medicine Group- Site Number : 8400051
Clyde, North Carolina, 28721
The Pediatric Center- Site Number : 8400075
Columbia, Maryland, 21045
Cedar Health Research - Dallas- Site Number : 8400092
Dallas, Texas, 75251
Vida Clinical Studies - Dearborn- Site Number : 8400094
Dearborn, Michigan, 48124
D&H Doral Research Center- Site Number : 8400095
Doral, Florida, 33122
Dolphin Medical Research, LLC- Site Number : 8400120
Doral, Florida, 33172
Nextlevel Research Center- Site Number : 8400065
Doral, Florida, 33172
Child Health Care Associates - East Syracuse- Site Number : 8400005
East Syracuse, New York, 13057
PAS Research - Children's Care Clinic- Site Number : 8400012
Edinburg, Texas, 78539
The Pediatric Center of Frederick- Site Number : 8400074
Frederick, Maryland, 21702
Helping Hands Healthcare Group - Fullerton- Site Number : 8400063
Fullerton, California, 92831
Full Circle Family Medicine- Site Number : 8400110
Germantown, Wisconsin, 53022
East Carolina University- Site Number : 8400061
Greenville, North Carolina, 27858
Cyn3rgy Research- Site Number : 8400029
Gresham, Oregon, 97030
Lakeview Clinical Research- Site Number : 8400054
Guntersville, Alabama, 35976
Advanced Investigative Medicine- Site Number : 8400055
Hawthorne, California, 90250
PAS Research - Henderson- Site Number : 8400033
Henderson, Nevada, 89014
Kid's Way Pediatrics- Site Number : 8400119
Hermitage, Pennsylvania, 16148
The University of Texas Health Science Center- Site Number : 8400024
Houston, Texas, 77030
Biopharma Informatic - Houston - Business Center Drive- Site Number : 8400108
Houston, Texas, 77043
Mercury Clinical Research - Houston - Savoy Drive- Site Number : 8400049
Houston, Texas, 77070
Pediatric Associates - Houston- Site Number : 8400101
Houston, Texas, 77087
Pioneer Research Solutions - Houston - Stancliff Road- Site Number : 8400126
Houston, Texas, 77099
Century Research Institute- Site Number : 8400118
Huntington Park, California, 90255
Matrix Clinical Research - Huntington Park- Site Number : 8400117
Huntington Park, California, 90255
GRO Clinical- Site Number : 8400109
Hyde Park, New York, 12538
Clinical Research Prime- Site Number : 8400022
Idaho Falls, Idaho, 83404
Jefferson City Medical Group- Site Number : 8400129
Jefferson City, Missouri, 65109
The Children's Clinic- Site Number : 8400079
Jonesboro, Arkansas, 72401
Wee Care Pediatrics - Kaysville- Site Number : 8400028
Kaysville, Utah, 84037
CuraCare- Site Number : 8400125
Kendall, Florida, 33176
Velocity Clinical Research - Lafayette- Site Number : 8400046
Lafayette, Louisiana, 70508
Wee Care Pediatrics - Layton- Site Number : 8400044
Layton, Utah, 84041
University of Kentucky Chandler Medical Center- Site Number : 8400034
Lexington, Kentucky, 40536
Midwest Children's Health Research Institute - Lincoln - Salt Creek Circle- Site Number : 8400019
Lincoln, Nebraska, 68504
Midwest Children's Health Research Institute- Site Number : 8400016
Lincoln, Nebraska, 68505
Be Well Clinical Studies - Lincoln- Site Number : 8400031
Lincoln, Nebraska, 68516
Midwest Childrens Health Research Institute- Site Number : 8400021
Lincoln, Nebraska, 68516
Midwest Children's Health Research Institute - Lincoln - West A Street- Site Number : 8400045
Lincoln, Nebraska, 68522
Matrix Clinical Research - Los Angeles- Site Number : 8400026
Los Angeles, California, 90057
Matrix Clinical Research - Los Angeles- Site Number : 8400123
Los Angeles, California, 90057
Novak Center For Children's Health- Site Number : 8400073
Louisville, Kentucky, 40202
Bluegrass Clinical Research - Louisville - Blankenbaker Parkway- Site Number : 8400056
Louisville, Kentucky, 40243
PAS RESEARCH-Lutz- Site Number : 8400103
Lutz, Florida, 33549
Alliance Research Institute - Lynwood- Site Number : 8400099
Lynwood, California, 90262
Madera Family Medical Group- Site Number : 8400011
Madera, California, 93637
FOMAT-Golden Valley Health Centers- Site Number : 8400084
Merced, California, 95340
Abba Medical Research- Site Number : 8400064
Miami, Florida, 33176
Clinical Research Institute - Minneapolis- Site Number : 8400002
Minneapolis, Minnesota, 55402
MidValley Research - Moline- Site Number : 8400096
Moline, Illinois, 61265
NOLA Research Works- Site Number : 8400035
New Orleans, Louisiana, 70125
D&H National Research Center- Site Number : 8400085
North Miami, Florida, 33169
Rio Clinical Trials - Canyon View- Site Number : 8400132
Ogden, Utah, 84404
Legacy Clinical Trials Oklahoma City- Site Number : 8400097
Oklahoma City, Oklahoma, 73103
Midway Medical Clinic- Site Number : 8400091
Oneonta, Alabama, 35121
Utah Valley Pediatrics - Orem- Site Number : 8400053
Orem, Utah, 84057
Stanford University Medical Center CTRU - 800 Welch Road- Site Number : 8400072
Palo Alto, California, 94304
Center for Clinical Trials - Paramount- Site Number : 8400100
Paramount, California, 90723
Alfa Medical Research LLC- Site Number : 8400111
Pembroke Pines, Florida, 33029
GLRI - McAllen Research- Site Number : 8400098
Pharr, Texas, 78577
Pas Research - Pittsburgh- Site Number : 8400050
Pittsburgh, Pennsylvania, 15227
AIM Trials- Site Number : 8400052
Plano, Texas, 75093
Ogden Clinic - Mountain View - CCT Research- Site Number : 8400032
Pleasant View, Utah, 84404
Pediatric Care - Provo- Site Number : 8400041
Provo, Utah, 84604
Pediatric Center - Richmond- Site Number : 8400122
Richmond, Texas, 77469
National Clinical Research- Site Number : 8400010
Richmond, Virginia, 23294
Wee Care Pediatrics - Roy- Site Number : 8400070
Roy, Utah, 84067
J. Lewis Research - Foothill Family Clinic - Salt Lake City- Site Number : 8400058
Salt Lake City, Utah, 84109
CenExel - iResearch - Savannah- Site Number : 8400057
Savannah, Georgia, 31405
Integrated Clinical Research LLC- Site Number : 8400027
Sherman Oaks, California, 91356-4173
Helios CR, Inc. - Little Rock- Site Number : 8400090
Sherwood, Arkansas, 72120
Virgo Carter Pediatrics- Site Number : 8400001
Silver Spring, Maryland, 20910
Tribe Clinical Research - Simpsonville- Site Number : 8400069
Simpsonville, South Carolina, 29680
Parkside Pediatrics - Simpsonville- Site Number : 8400078
Simpsonville, South Carolina, 29681
South Bend Clinic - Main Campus- Site Number : 8400023
South Bend, Indiana, 46617
Tribe Clinical Research - Spartanburg- Site Number : 8400083
Spartanburg, South Carolina, 29301
Piedmont Healthcare - Family Medicine- Site Number : 8400077
Statesville, North Carolina, 28625
SUNY Upstate Medical University - Syracuse- Site Number : 8400115
Syracuse, New York, 13210
Wee Care Pediatrics - Syracuse- Site Number : 8400066
Syracuse, Utah, 84075
PAS Research - Tampa- Site Number : 8400113
Tampa, Florida, 33613
PAS Research-Bronx- Site Number : 8400104
The Bronx, New York, 10460
Advantage Clinical Trials- Site Number : 8400030
The Bronx, New York, 10468
North Houston Internal Medicine & Pediatric Clinic- Site Number : 8400018
Tomball, Texas, 77375
Noble Clinical Research- Site Number : 8400121
Tucson, Arizona, 85704
Emerson Clinical Research Institute - Washington - Connecticut Avenue- Site Number : 8400102
Washington D.C., District of Columbia, 20009
Emanate Health - Queen of the Valley Hospital- Site Number : 8400105
West Covina, California, 91790
Integrated Clinical Trial Services- Site Number : 8400059
West Des Moines, Iowa, 50265
All In One Clinic- Site Number : 8400127
Whittier, California, 90601
Amicis Research Center-Winnetka- Site Number : 8400128
Winnetka, California, 91306
Turkey (Türkiye)9 sites
Investigational Site Number : 7920004
Ankara, 06230
Investigational Site Number : 7920002
Ankara, 06620
Investigational Site Number : 7920006
Ankara, 06800
Investigational Site Number : 7920003
Istanbul, 34098
Investigational Site Number : 7920007
Istanbul, 34384
Investigational Site Number : 7920009
Izmir, 35100
Investigational Site Number : 7920005
Izmir, 35120
Investigational Site Number : 7920008
Izmir, 35540
Investigational Site Number : 7920010
Trabzon, 61080
Puerto Rico8 sites
Investigational Site Number : 6300001
Bayamón, 00961
Investigational Site Number : 6300002
Bayamón, 00961
Investigational Site Number : 6300005
Guayama, 00786
Investigational Site Number : 6300008
Ponce, 00716
Investigational Site Number : 6300004
Ponce, 00717
Investigational Site Number : 6300003
San Juan, 00907
Investigational Site Number : 6300006
San Juan, 00918
Investigational Site Number : 6300007
Trujillo Alto, 00976
Mexico6 sites
Investigational Site Number : 4840009
Cuernavaca, Morelos, 62290
Investigational Site Number : 4840008
Ecatepec de Morelos, 55075
Investigational Site Number : 4840003
León, Guanajuato, 37320
Investigational Site Number : 4840001
Mexico City, Mexico City, 04530
Investigational Site Number : 4840007
Morelia, Michoacán, 58350
Investigational Site Number : 4840002
Temixco, Morelos, 62587
Honduras3 sites
Investigational Site Number : 3400001
San Pedro Sula, 21104
Investigational Site Number : 3400002
Tegucigalpa, 11101
Investigational Site Number : 3400003
Tegucigalpa, 11101
Thailand3 sites
Investigational Site Number : 7640002
Bangkok, 10400
Investigational Site Number : 7640001
Chiang Mai, 50180
Investigational Site Number : 7640003
Hat Yai, 90110
About this study
Official title: A Phase 3, Randomized, Modified Double-blind, Active-controlled, Parallel-group, 2 Arm Study to Investigate the Safety of a 4-dose Regimen of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants and Toddlers
This study is a Phase 3, randomized, modified double-blind study which aims to document the safety profile of the PCV21 vaccine (investigational pneumococcal vaccine) compared to a licensed 20-valent pneumococcal conjugate vaccine in infants aged from approximately 2 months (42 to 89 days).
The study duration per participant will be up to approximately 19 months. The study vaccines (either PCV21 or 20vPCV) will be administered at approximately 2, 4, 6 and 12 to 15 months of age. Routine pediatric vaccines will be given as per local recommendations.
Read more
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 until 15 months of age, V06 separated from V05 by 30 days.
- Conditions
- Pneumococcal Immunization
- Being tested
- PCV21 vaccine, Prevnar 20 vaccine, M-M-R II vaccine, Rotarix, RotaTeq
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
PCV21 vaccineBiological
Also called 515
Pharmaceutical form:Suspension for injection-Route of administration:Intramuscular
Prevnar 20 vaccineBiological
Also called Prevnar20™
Pharmaceutical form:Suspension for injection-Route of administration:Intramuscular
M-M-R II vaccineBiological
Also called M-M-R™ II
Pharmaceutical form:Powder, lyophilized, for suspension for reconstitution-Route of administration:Subcutaneous or Intramuscular
RotarixBiological
Also called Rotarix™
Pharmaceutical form:Solution-Route of administration:Oral
RotaTeqBiological
Also called RotaTeq™
Pharmaceutical form:Solution-Route of administration:Oral
Vaxelis vaccineBiological
Also called Vaxelis™
Pharmaceutical form:Suspension for injection-Route of administration:Intramuscular
VarivaxBiological
Also called Varivax™
Pharmaceutical form:Powder, lyophilized, for suspension for reconstitution-Route of administration:Subcutaneous or Intramuscular
PriorixBiological
Also called Priorix™
Pharmaceutical form:Lyophilized, for suspension for reconstitution-Route of administration:Subcutaneous
VAQTABiological
Also called VAQTA™
Pharmaceutical form:Suspension for Injection-Route of administration:Intramuscular
HavrixBiological
Also called Havrix™
Pharmaceutical form:Suspension for Injection-Route of administration:Intramuscular
| Study group | Role | What they receive |
|---|---|---|
| Group 1: PCV21 | Experimental | Participants will be administered via intramuscular injection (IM) a 4-dose PCV21 regimen at approximately 2, 4, 6 and 12 to 15 MoA Receives: Biological: PCV21 vaccine; Biological: M-M-R II vaccine; Biological: Rotarix; Biological: RotaTeq; Biological: Vaxelis vaccine; Biological: Varivax; Biological: Priorix; Biological: VAQTA; Biological: Havrix |
| Group 2: 20vPCV | Active comparator | Participants will be administered via intramuscular injection (IM) a 4-dose 20vPCV regimen at approximately 2, 4, 6 and 12 to 15 MoA Receives: Biological: Prevnar 20 vaccine; Biological: M-M-R II vaccine; Biological: Rotarix; Biological: RotaTeq; Biological: Vaxelis vaccine; Biological: Varivax; Biological: Priorix; Biological: VAQTA; Biological: Havrix |
What is being measured
The primary outcome is the main question the study is designed to answer.
Presence of any immediate adverse events (AEs)
Number of participants experiencing solicited and unsolicited immediate AEs
Measured: Within 30 minutes after each vaccination
Presence of solicited injection site and systemic reactions through 7 days after each vaccine injection
Number of participants experiencing solicited injection site and systemic reactions
Measured: Through 7 days after each vaccine injection
Presence of unsolicited (spontaneously reported) injection site reactions and unsolicited systemic AEs through 30 days after each vaccine injection
Number of participants experiencing unsolicited injection site reactions and unsolicited systemic AEs
Measured: Through 30 days after each vaccine injection
Presence of serious adverse events (SAEs) throughout the study (through 6 months post- last vaccine injection)
Number of participants experiencing SAEs
Measured: Throughout the study (through 6 months post-last vaccine injection), approximately 19 months
Presence adverse events of special interest (AESIs) throughout the study (through 6 months post- last vaccine injection)
Number of participants experiencing AESIs
Measured: Throughout the study (through 6 months post-last vaccine injection), approximately 19 months
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted13 Feb 2025
- Study start18 Feb 2025
- Primary completion22 Oct 2027 (estimated)
- Study completion22 Oct 2027 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Pneumococcal ImmunizationStudies of the same condition, open and under way.
- More trials run by SanofiThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 3
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind
- Who is masked
- Participant, Care provider, Investigator, Outcomes assessor
- Enrolment
- 2,360 participants (actual)
Sponsor and investigators
- Lead sponsor
- Sanofi
- Sponsor type
- Industry (pharma, biotech, devices)
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06824194
- Sponsor's protocol ID
- PSK05
- Other IDs
- U1111-1295-5983
- Status last verified
- Apr 2026
- First submitted
- 7 Feb 2025
- Last updated
- 13 Apr 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- Yes: 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
Study at a glance
From the registry record, last updated by the sponsor on 13 Apr 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Phase 3, Randomized, Modified Double-blind, Active-controlled, Parallel-group, 2 Arm Study to Investigate the Safety of a 4-dose Regimen of a 21-valent Pneumococcal Conjugate Vaccine in Healthy Infants and Toddlers
- ClinicalTrials.gov ID
- NCT06824194
- Acronym / sponsor ID
- PSK05
- Conditions
- Pneumococcal Immunization
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Active, not recruiting
- Enrolment
- 2,360 participants (actual)
- Lead sponsor
- SanofiIndustry (pharma, biotech, devices)
- Study start
- 18 Feb 2025 (actual)
- Primary completion
- 22 Oct 2027 (estimated)
- Study completion
- 22 Oct 2027 (estimated)
- First posted
- 13 Feb 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study is a Phase 3, randomized, modified double-blind study which aims to document the safety profile of the PCV21 vaccine (investigational pneumococcal vaccine) compared to a licensed 20-valent pneumococcal conjugate vaccine in infants aged from approximately 2 months (42 to 89 days).
The study duration per participant will be up to approximately 19 months. The study vaccines (either PCV21 or 20vPCV) will be administered at approximately 2, 4, 6 and 12 to 15 months of age. 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 until 15 months of age, V06 separated from V05 by 30 days.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind (participant, care provider, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Group 1: PCV21 | Experimental | Biological: PCV21 vaccine, Biological: M-M-R II vaccine, Biological: Rotarix, Biological: RotaTeq, Biological: Vaxelis vaccine, Biological: Varivax, Biological: Priorix, Biological: VAQTA, Biological: HavrixParticipants will be administered via intramuscular injection (IM) a 4-dose PCV21 regimen at approximately 2, 4, 6 and 12 to 15 MoA |
| Group 2: 20vPCV | Active comparator | Biological: Prevnar 20 vaccine, Biological: M-M-R II vaccine, Biological: Rotarix, Biological: RotaTeq, Biological: Vaxelis vaccine, Biological: Varivax, Biological: Priorix, Biological: VAQTA, Biological: HavrixParticipants will be administered via intramuscular injection (IM) a 4-dose 20vPCV regimen at approximately 2, 4, 6 and 12 to 15 MoA |
Who may qualify
- Ages
- 42 to 89 days
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child
Key inclusion criteria (3 listed)
- 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 as assessed by the investigator
Key exclusion criteria (18 listed)
- 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 substances
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| PCV21 vaccineAlso: 515Pharmaceutical form:Suspension for injection-Route of administration:Intramuscular | Biological | Group 1: PCV21 |
| Prevnar 20 vaccineAlso: Prevnar20™Pharmaceutical form:Suspension for injection-Route of administration:Intramuscular | Biological | Group 2: 20vPCV |
| M-M-R II vaccineAlso: M-M-R™ IIPharmaceutical form:Powder, lyophilized, for suspension for reconstitution-Route of administration:Subcutaneous or Intramuscular | Biological | Group 1: PCV21, Group 2: 20vPCV |
| RotarixAlso: Rotarix™Pharmaceutical form:Solution-Route of administration:Oral | Biological | Group 1: PCV21, Group 2: 20vPCV |
| RotaTeqAlso: RotaTeq™Pharmaceutical form:Solution-Route of administration:Oral | Biological | Group 1: PCV21, Group 2: 20vPCV |
| Vaxelis vaccineAlso: Vaxelis™Pharmaceutical form:Suspension for injection-Route of administration:Intramuscular | Biological | Group 1: PCV21, Group 2: 20vPCV |
| VarivaxAlso: Varivax™Pharmaceutical form:Powder, lyophilized, for suspension for reconstitution-Route of administration:Subcutaneous or Intramuscular | Biological | Group 1: PCV21, Group 2: 20vPCV |
| PriorixAlso: Priorix™Pharmaceutical form:Lyophilized, for suspension for reconstitution-Route of administration:Subcutaneous | Biological | Group 1: PCV21, Group 2: 20vPCV |
| VAQTAAlso: VAQTA™Pharmaceutical form:Suspension for Injection-Route of administration:Intramuscular | Biological | Group 1: PCV21, Group 2: 20vPCV |
| HavrixAlso: Havrix™Pharmaceutical form:Suspension for Injection-Route of administration:Intramuscular | Biological | Group 1: PCV21, Group 2: 20vPCV |
Primary outcome
Presence of any immediate adverse events (AEs)
Time frame: Within 30 minutes after each vaccination
Number of participants experiencing solicited and unsolicited immediate AEs
Presence of solicited injection site and systemic reactions through 7 days after each vaccine injection
Time frame: Through 7 days after each vaccine injection
Number of participants experiencing solicited injection site and systemic reactions
Presence of unsolicited (spontaneously reported) injection site reactions and unsolicited systemic AEs through 30 days after each vaccine injection
Time frame: Through 30 days after each vaccine injection
Number of participants experiencing unsolicited injection site reactions and unsolicited systemic AEs
Presence of serious adverse events (SAEs) throughout the study (through 6 months post- last vaccine injection)
Time frame: Throughout the study (through 6 months post-last vaccine injection), approximately 19 months
Number of participants experiencing SAEs
Presence adverse events of special interest (AESIs) throughout the study (through 6 months post- last vaccine injection)
Time frame: Throughout the study (through 6 months post-last vaccine injection), approximately 19 months
Number of participants experiencing AESIs
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 13 Apr 2026.
- PSK05 Plain Language Results SummaryLink provided by the sponsor.
- Individual participant dataSharing planned: Yes. 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
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
132 sites in 6 countries: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing PCV21 vaccine, Prevnar 20 vaccine and M-M-R II vaccine in people with Pneumococcal Immunization, run by Sanofi at 132 sites in 6 countries.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 18 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: under way, not looking for participants, as of the sponsor's last update on 13 Apr 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 132 sites in United States, Turkey (Türkiye), Puerto Rico, Mexico, Honduras and 1 more country. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Presence of any immediate adverse events (AEs) (time frame: Within 30 minutes after each vaccination). The study lists 5 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 13 Apr 2026.