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20vPnC

Phase 3

Pneumococcal Disease | Monoclonal antibody | Infectious Disease |Pfizer, Inc.|Last Updated: Aug 10, 2026

Success Probability

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials6
Total Enrollment8,476

FDA Designations

No designations recorded

Clinical trial landscape

20vPnC · 7 trials · 2 indications

Phase 3 5Phase 1 2
NCT07754539A Study to Evaluate 20vPnC in Healthy Chinese InfantsPneumococcal Diseases
RECRUITING1,250 Analytics
NCT0487553320-valent Pneumococcal Conjugate Vaccine Safety and Immunogenicity Study in Pneumococcal Vaccine-Naïve Adults 60 Years of Age and Older in Japan, Korea, and TaiwanPneumococcal Disease
COMPLETED1,425 Analytics
NCT04642079Safety and Immunogenicity Study of 20vPnC in Healthy Children 15 Months Through 17 Years of AgePneumococcal Disease
COMPLETED839 Analytics
NCT03828617Trial to Evaluate the Safety and Immunogenicity of 3 Lots of 20-valent Pneumococcal Conjugate Vaccine in Pneumococcal Vaccine-Naïve AdultsPneumococcal Disease
COMPLETED1,710 Analytics
NCT03760146Trial to Evaluate the Safety and Immunogenicity of a 20-valent Pneumococcal Conjugate Vaccine in Pneumococcal Vaccine-naïve AdultsPneumococcal Disease
COMPLETED3,902 Analytics
PHASE3RECRUITING
A Study to Evaluate 20vPnC in Healthy Chinese Infants
Pneumococcal DiseasesUnlock trial analytics
PHASE3COMPLETED
20-valent Pneumococcal Conjugate Vaccine Safety and Immunogenicity Study in Pneumococcal Vaccine-Naïve Adults 60 Years of Age and Older in Japan, Korea, and Taiwan
Pneumococcal DiseaseUnlock trial analytics
PHASE3COMPLETED
Safety and Immunogenicity Study of 20vPnC in Healthy Children 15 Months Through 17 Years of Age
Pneumococcal DiseaseUnlock trial analytics
PHASE3COMPLETED
Trial to Evaluate the Safety and Immunogenicity of 3 Lots of 20-valent Pneumococcal Conjugate Vaccine in Pneumococcal Vaccine-Naïve Adults
Pneumococcal DiseaseUnlock trial analytics
PHASE3COMPLETED
Trial to Evaluate the Safety and Immunogenicity of a 20-valent Pneumococcal Conjugate Vaccine in Pneumococcal Vaccine-naïve Adults
Pneumococcal DiseaseUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of participants reporting prespecified local reactions
From Day 1 (the day of vaccination) through Day 7 following Vaccinations 1, 2, 3, and 4
Percentage of participants reporting prespecified systemic events
From Day 1 (the day of vaccination) through Day 7 following Vaccinations 1, 2, 3, and 4
Percentage of participants reporting Adverse Events (AEs) from the first study vaccination through 1 month following the third study vaccination.
From the first study vaccination to 1 month after the third study vaccination
Percentage of participants reporting AEs from the fourth study vaccination to 1 month following the fourth study vaccination.
From the fourth study vaccination to 1 month after the fourth study vaccination
Percentage of participants reporting serious adverse events (SAEs) through 6 months post last vaccination
From the first study vaccination to 6 months after the last study vaccination
The percentages of participants with predefined serotype-specific immunoglobulin G (IgG) concentrations in 20vPnC group compared to 13vPnC group at 1 month after Dose 3
At 1 month after Dose 3
The serotype-specific IgG geometric mean concentrations (GMCs) in 20vPnC group compared to 13vPnC group at 1 month after Dose 3
At 1 month after Dose 3
Percentage of Participants With Prompted Local Reactions Within 10 Days After Vaccination 1 (20vPnC or 13vPnC)
Within 10 days after 20vPnC in the 20vPnC/Saline group or 13vPnC in the 13vPnC/PPSV23 group

Reactions were collected in the e-diary including redness, swelling, and pain at the injection site. Exact 2-sided CI was calculated based on the Clopper and Pearson method. Redness and swelling were graded as mild (\>2.0 to 5.0 cm), moderate (\>5.0 to 10.0 cm), and severe (\>10.0 cm). Pain at the injection site was graded as mild (does not interfere with activity), moderate (interferes with activity), and severe (prevents daily activity).

Percentage of Participants With Prompted Systemic Events Within 7 Days After Vaccination 1 (20vPnC or 13vPnC)
Within 7 days after 20vPnC in the 20vPnC/Saline group or 13vPnC in the 13vPnC/PPSV23 group

Events were collected in the e-diary including fever, headache, fatigue, muscle pain, and joint pain. Exact 2-sided CI was calculated based on the Clopper and Pearson method. Fever was categorized as ≥38.0 degree Celsius (°C), ≥38.0°C to 38.4°C, \>38.4°C to 38.9°C, \>38.9°C to 40.0°C, and \>40.0°C. Fatigue, headache, muscle pain, and joint pain were graded as mild (does not interfere with activity), moderate (some interference with activity), and severe (prevents daily activity).

Percentage of Participants With Adverse Events (AEs) Within 1 Month After Vaccination 1 (20vPnC or 13vPnC)
Within 1 month after 20vPnC in the 20vPnC/Saline group or 13vPnC in the 13vPnC/PPSV23 group

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention.

Percentage of Participants With Serious Adverse Events (SAEs) Within 1 Month After Vaccination 1 (20vPnC or 13vPnC)
Within 1 Month After Vaccination 1 (20vPnC or 13vPnC)

An SAE was any untoward medical occurrence at any dose that resulted in death; was life-threatening; required inpatient hospitalization or prolongation of existing hospitalization; resulted in persistent disability/incapacity; resulted in congenital anomaly/birth defect or that was considered to be an important medical event.

Pneumococcal Opsonophagocytic Activity (OPA) Geometric Mean Titers (GMTs) for 13-matched Serotypes at 1 Month After Vaccination 1 (20vPnC or 13vPnC)
1 month after 20vPnC in the 20vPnC/Saline group or 13vPnC in the 13vPnC/PPSV23 group

OPA titers were determined for the 13 matching pneumococcal serotypes: 1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, 23F. GMTs and 2-sided CIs were calculated by exponentiating the Least Square (LS) means and the corresponding CIs based on analysis of log-transformed OPA titers using a regression model with vaccine group, sex, smoking status, age at vaccination in years (continuous), baseline log-transformed OPA titers, and country.

Pneumococcal OPA GMTs for 7 Additional Serotypes at 1 Month After Vaccination 1 (20vPnC) or 1 Month After Vaccination 2 (PPSV23)
1 month after 20vPnC in the 20vPnC/Saline group or 1 month after PPSV23 in the 13vPnC/PPSV23 group.

OPA titers were determined for serotypes: 8, 10A, 11A, 12F, 15B, 22F, and 33F. GMTs and 2-sided CIs were calculated by exponentiating the LS means and the corresponding CIs based on analysis of log-transformed OPA titers using a regression model with vaccine group, sex, smoking status, age at vaccination in years (continuous), baseline log-transformed OPA titers, and country.

Percentage of Participants Reporting Prompted Local Reactions Within 7 Days After Vaccination
Within 7 days after vaccination on Day 1

Local reactions included redness, swelling and, pain at the injection site, recorded by parent's/legal guardians of participants in an electronic diary (e-diary). Redness and swelling were measured and recorded in measuring device units. One measuring device unit =0.5 centimeter (cm). Redness and swelling were graded as mild: \> 0.0 to 2.0 cm, moderate: \>2.0 to 7.0 cm and severe: \>7.0 cm. Pain at the injection site was graded as mild: hurt if gently touched (cohort 1) and did not interfere with activity (cohort 2-4); moderate: hurt if gently touched with crying (cohort 1) and interfered with daily activity (cohort 2-4) and; severe: limited limb movement (cohort 1) and prevented daily activity (cohort 2-4). 95 percent (%) confidence interval (CI) was based on Clopper and Pearson method.

Percentage of Participants Reporting Prompted Systemic Events Within 7 Days After Vaccination: Cohort 1
Within 7 days after vaccination on Day 1

Systemic events for Cohort 1 included fever, decreased appetite, drowsiness/increased sleep and irritability, recorded by parents/legal guardians of participant's using an e-diary. Fever was defined as temperature \>=38.0 degrees Celsius (C) and categorized as \>=38.0 to 38.4 degrees C, \>38.4 to 38.9 degrees C, \>38.9 to 40.0 degrees C and \>40.0-degrees C. Decreased appetite was graded as mild (decreased interest in eating), moderate (decreased oral intake) and severe (refusal to feed). Drowsiness was graded as mild (increased or prolonged sleeping bouts), moderate (slightly subdued, interfered with daily activity) and severe (disabling, not interested in usual daily activity). Irritability: graded as mild (easily consolable), moderate (required increased attention) and severe (inconsolable, crying could not be comforted). 95% CI was based on Clopper and Pearson method.

Percentage of Participants Reporting Prompted Systemic Events Within 7 Days After Vaccination: Cohorts 2, 3 and 4
Within 7 days after vaccination on Day 1

Systemic events for Cohort 2-4 included fever, fatigue, headache, muscle pain and joint pain, recorded by parents/legal guardians of participant's using an e-diary. Fever was defined as temperature \>=38.0 degrees C and categorized as \>=38.0 to 38.4 degrees C, \>38.4 to 38.9 degrees C, \>38.9 to 40.0 degrees C and \>40.0 degrees C. Fatigue, headache, muscle pain and joint pain were graded as mild (no interference with activity), moderate (some interference with activity) and severe (prevents daily routine activity). 95% CI was based on Clopper and Pearson method.

Percentage of Participants Reporting Adverse Events (AEs) up to 1 Month After Vaccination
From vaccination (on Day 1) up to 1 month after vaccination

An AE was any untoward medical occurrence in a participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. 95% CI was based on the Clopper and Pearson method. Only AEs collected by non-systematic assessment (i.e. excluding local reactions and systemic events) were reported in this outcome measure.

Percentage of Participants Reporting Serious Adverse Events (SAEs) up to 6 Months After Vaccination
From vaccination (on Day 1) up to 6 months after vaccination

An SAE was any untoward medical occurrence that occurred, at any dose: resulted in death; required inpatient hospitalization or prolongation of existing hospitalization; was life-threatening; resulted in persistent or significant disability/ incapacity; was a congenital anomaly/birth defect and other important medical events. 95% CI was based on the Clopper and Pearson method.

Percentage of Participants Reporting Newly Diagnosed Chronic Medical Conditions (NDCMCs) up to 6 Months After Vaccination
From vaccination (on Day 1) up to 6 months after vaccination

An NDCMC was defined as a disease or medical condition, not previously identified, that was expected to be persistent or was otherwise long-lasting in its effects. 95% CI was based on the Clopper and Pearson method.

Geometric Mean Fold Rises (GMFRs) of Pneumococcal Serotype-Specific Immunoglobulin G (IgG) Concentrations for the 7 Additional Serotypes From Before to 1 Month After 20vPnC Vaccination: Cohort 1 and 2
Before vaccination on Day 1 to 1 month after vaccination

Pneumococcal serotype-specific IgG concentrations were measured from serum samples for the 7 additional 20vPnC serotypes: 8, 10A, 11A, 12F, 15B, 22F and 33F. GMFR = geometric mean of fold rise from before vaccination on Day 1 to 1 month after vaccination with 20vPnC. GMFRs and corresponding 2-sided 95% CIs were calculated by exponentiating the mean logarithm of fold rises and the corresponding 2-sided 95% CIs (based on Student's t distribution). Superiority of IgG concentration 1 month after 20vPnC to before vaccination for each serotype was demonstrated if the 95% lower CI of GMFR was \>1.

GMFRs of Pneumococcal Serotype-Specific Opsonophagocytic Activity (OPA) Titers for the 7 Additional Serotypes From Before to 1 Month After 20vPnC Vaccination: Cohort 3 and 4
Before vaccination on Day 1 to 1 month after vaccination

Pneumococcal serotype-specific OPA titers were measured from serum samples for 7 the additional 20vPnC serotypes: 8, 10A, 11A, 12F, 15B, 22F and 33F. GMFR = geometric mean of fold rise from before vaccination on Day 1 to 1 month after vaccination with 20vPnC. GMFRs and the corresponding 2-sided 95% CIs were calculated by exponentiating the mean logarithm of fold rises and the corresponding 2-sided 95% CIs (based on the Student's t distribution). Superiority of OPA titers 1 month after 20vPnC to before vaccination for each serotype was demonstrated if the 95% lower CI of the GMFR was \>1.

Percentage of Participants With Local Reactions Within 10 Days After Vaccination
Within 10 days after vaccination

Local reactions were recorded using an electronic diary. Local reactions included redness, swelling and pain at the injection site. Redness and swelling were measured and recorded in measuring device units. 1 measuring device unit =0.5 centimeter (cm). Redness and swelling were graded as mild (greater than \[\>\] 2.0 to 5.0 cm), moderate (\>5.0 to 10.0 cm) and severe (\>10.0 cm). Pain at injection site was graded as mild (did not interfere with activity), moderate (interfered with activity), and severe (prevented daily activity). Data for this outcome measure was planned to be analyzed for the pooled 20vPnC vaccine groups (20vPnC Lots 1, 2 and 3) and 13vPnC group.

Percentage of Participants With Systemic Events Within 7 Days After Vaccination
Within 7 days after vaccination

Systemic events fever, fatigue, headache, muscle pain, joint pain were recorded by using an electronic diary. Fever was defined as greater than or equal to (\>=) 38.0 degree Celsius (C) and categorized to \>=38.0 to 38.4 degree C, \>38.4 to 38.9 degree C, \>38.9 to 40.0 degree C and \>40.0 degree C. Fatigue, headache, muscle pain and joint pain were graded as mild (did not interfere with activity), moderate (some interference with activity) and severe (prevented daily routine activity). Data for this outcome measure was planned to be analyzed for the pooled 20vPnC vaccine groups (20vPnC Lots 1, 2 and 3) and 13vPnC group.

Percentage of Participants With Any Adverse Events (AEs) Within 1 Month After Vaccination
Within 1 month after vaccination

An AE was any untoward medical occurrence in study participants who received study vaccine without regard to possibility of causal relationship. Data for this outcome measure was planned to be analyzed for the pooled 20vPnC vaccine groups (20vPnC Lots 1, 2 and 3) and 13vPnC group.

Percentage of Participants With Any Serious Adverse Events (SAEs) Within 6 Months After Vaccination
Within 6 month after vaccination

An SAE was any untoward medical occurrence at any dose that results in death; is life-threatening (immediate risk of death); requires inpatient hospitalization or prolongation of existing hospitalization; results in persistent or significant disability/incapacity (substantial disruption of the ability to conduct normal life functions); results in congenital anomaly/birth defect or that is considered to be an important medical event. Data for this outcome measure was planned to be analyzed for the pooled 20vPnC vaccine groups (20vPnC Lots 1, 2 and 3) and 13vPnC group.

Percentage of Participants With Any Newly Diagnosed Chronic Medical Conditions (NDCMCs) Within 6 Months After Vaccination
Within 6 months after vaccination

An NDCMC was defined as a disease or medical condition, not previously identified, that was expected to be persistent or was otherwise long-lasting in its effects. Data for this outcome measure was planned to be analyzed for the pooled 20vPnC vaccine groups (20vPnC Lots 1, 2 and 3) and 13vPnC group.

Serotype-specific Pneumococcal Opsonophagocytic Activity (OPA) Geometric Mean Titers (GMTs) at 1 Month After Vaccination
1 month after vaccination

OPA titers were determined for serotypes: 1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, 23F, 8, 10A, 11A, 12F, 15B, 22F and 33F. OPA titer was expressed as reciprocal of the highest serum dilution. OPA GMTs and 2-sided 95% CIs were calculated. Data for this outcome measure were planned to be analyzed for the 20vPnC vaccine groups (20vPnC Lots 1, 2 and 3) only.

Percentage of Participants With Local Reactions Within 10 Days After Vaccination in All Cohorts
Within 10 days after 20vPnC or 13vPnC

Local reactions were recorded using an electronic diary. Local reactions included redness, swelling and pain at the injection site. Redness and swelling were measured and recorded in measuring device units. 1 measuring device unit =0.5 centimeter (cm). Redness and swelling were graded as mild (greater than \[\>\] 2.0 to 5.0 cm), moderate (\>5.0 to 10.0 cm) and severe (\>10.0 cm). Pain at injection site was graded as mild (did not interfere with activity), moderate (interfered with activity), and severe (prevented daily activity).

Percentage of Participants With Systemic Events Within 7 Days After Vaccination in All Cohorts
Within 7 days after 20vPnC or 13vPnC

Systemic events fever, fatigue, headache, muscle pain and joint pain were recorded by using an electronic diary. Fever was defined as greater than or equal to (\>=) 38.0 degree Celsius (C) and categorized to \>=38.0 to 38.4 degree C, \>38.4 to 38.9 degree C, \>38.9 to 40.0 degree C and \>40.0 degree C. Fatigue, headache, muscle pain and joint pain were graded as mild (did not interfere with activity), moderate (some interference with activity) and severe (prevented daily routine activity).

Percentage of Participants With Adverse Events (AEs) Within 1 Month After Vaccination in All Cohorts
Within 1 month after 20vPnC or 13vPnC

An AE was any untoward medical occurrence in study participants who received study vaccine without regard to possibility of causal relationship with the treatment.

Percentage of Participants With Serious Adverse Events (SAEs) Within 6 Months After Vaccination in All Cohorts
Within 6 months after 20vPnC or 13vPnC

An SAE was any untoward medical occurrence at any dose that results in death; is life-threatening (immediate risk of death); requires inpatient hospitalization or prolongation of existing hospitalization; results in persistent or significant disability/incapacity (substantial disruption of the ability to conduct normal life functions); results in congenital anomaly/birth defect or that is considered to be an important medical event.

Percentage of Participants With Newly Diagnosed Chronic Medical Conditions (NDCMCs) Within 6 Months After Vaccination in All Cohorts
Within 6 months after 20vPnC or 13vPnC

An NDCMC was defined as a disease or medical condition, not previously identified, that was expected to be persistent or was otherwise long-lasting in its effects.

Pneumococcal Opsonophagocytic Activity (OPA) Geometric Mean Titers (GMTs) for the 13 Matched Serotypes at 1 Month After Vaccination 1 (20vPnC or 13vPnC) in Cohort 1: Evaluable 13-Matched Immunogenicity Population
1 month after Vaccination 1

OPA GMTs were determined for serotypes: 1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F and 23F. OPA titer was expressed as reciprocal of the highest serum dilution. OPA geometric mean and 2-sided 95% CIs were calculated.

Pneumococcal OPA GMTs for the 7 Additional Serotypes at 1 Month After Vaccination 1 (20vPnC) or 1 Month After Vaccination 2 (PPSV23) in Cohort 1: Evaluable 7-Additional Immunogenicity Population (E7-AIP)
1 month after Vaccination 1 in "Cohort 1: 20vPnC/Saline"; 1 month after Vaccination 2 in "Cohort 1: 13vPnC/PPSV23"

OPA GMTs were determined for serotypes: 8, 10A, 11A, 12F, 15B, 22F and 33F. OPA titer was expressed as reciprocal of the highest serum dilution. OPA geometric mean and 2-sided 95% CIs were calculated.

Percentage of participants reporting prompted local reactions within 7 days following investigational product administration
Within 7 days after vaccination

Prespecified local reactions (redness, swelling, and pain at the injection site)

Percentage of participants reporting prompted systemic events within 7 days following investigational product administration
Within 7 days after vaccination

Prespecified systemic events (fever, headache, fatigue, muscle pain, and joint pain)

Percentage of participants reporting adverse events (AEs) through 1 month following investigational product administration
Within 1 month after vaccination

Adverse events occurring within 1 month after vaccination

Percentage of participants reporting serious adverse events (SAEs) throughout the study
Within 6 months after vaccination

SAEs occurring within 6 months after vaccination

Percentage of participants reporting abnormal hematology, biochemistry, and urinalysis and microscopy laboratory values
3 to 5 days after vaccination

Abnormal hematology, biochemistry, and urinalysis and microscopy laboratory values

Percentage of participants reporting prespecified local reactions within 7 days following each study intervention
Within 7 days of each study intervention

Prespecified local reactions following each study intervention

Percentage of participants reporting prespecified systemic events within 7 days following each study intervention
Within 7 days of each study intervention

Prespecified systemic events following each study intervention

Percentage of participants reporting adverse events (AEs) from the first study intervention through 1 month following the last study intervention administration
1 month after the last vaccination

AEs occurring through 1 month following the last study intervention administration for participants of adults ≥18 to \<50 years of age at the time of consent, and children and infants ≥7 months to \<6 years of age at the time of consent.

Percentage of participants reporting AEs from the first study intervention through 1 month following the third study intervention.
From the first study intervention to 1 month after the third study intervention

AEs occurring from the first study intervention through 1 month following the third study intervention in infants ≥42 to ≤98 days of age at the time of consent.

Percentage of participants reporting AEs from the fourth study intervention to 1 month following the fourth study intervention.
From the fourth study intervention to 1 month after the fourth study intervention

AEs occurring from the fourth study intervention to 1 month following the fourth study intervention in infants ≥42 to ≤98 days of age at the time of consent.

Secondary Endpoints

The percentages of participants with predefined serotype-specific immunoglobulin G (IgG) concentrations in 20vPnC group compared to 13vPnC group at 1 month after Dose 4
At 1 month after Dose 4
The serotype-specific IgG geometric mean concentrations (GMCs) in 20vPnC group compared to 13vPnC group at 1 month after Dose 4
At 1 month after Dose 4
To further describe the immune response of 20vPnC
At prior to Dose 1, 1 months after Dose 3, prior to Dose 4 and 1 month after Dose 4
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
13vPnC groupACTIVE_COMPARATORParticipants receive 13vPnC at approximately 2, 4, and 6 months of age (Doses 1 through 3) and 12 through 15 months of age (Dose 4)
20vPnC groupEXPERIMENTALParticipants receive 20vPnC at approximately 2, 4, and 6 months of age (Doses 1 through 3) and 12 through 15 months of age (Dose 4)
20vPnC/SalineEXPERIMENTAL20vPnC and saline
13vPnC/PPSV23ACTIVE_COMPARATOR13vPnC and PPSV23
Cohort 1: =>15 through 23 months of ageEXPERIMENTAL20vPnC
Cohort 2: 2 through 4 years of ageEXPERIMENTAL20vPnC
Cohort 3: 5 through 9 years of ageEXPERIMENTAL20vPnC
Cohort 4: 10 through 17 years of ageEXPERIMENTAL20vPnC
20vPnC Lot 1EXPERIMENTAL20vPnC Lot 1
20vPnC Lot 2EXPERIMENTAL20vPnC Lot 2
20vPnC Lot 3EXPERIMENTAL20vPnC Lot 3
13vPnCACTIVE_COMPARATOR13vPnC
60 years and above 20vPnC/SalineEXPERIMENTAL20vPnC and saline
60 years and above 13vPnC/PPSV23ACTIVE_COMPARATOR13vPnC and PPSV23
50 through 59 years of age 20vPnCEXPERIMENTAL20vPnC
18 through 49 years of age 20vPnCEXPERIMENTAL20vPnC
50 through 59 years of age 13vPnCACTIVE_COMPARATOR13vPnC
18 through 49 years of age 13vPnCACTIVE_COMPARATOR13vPnC
20vPnCEXPERIMENTALSingle dose of 20-valent pneumococcal conjugate vaccine
Cohort 1EXPERIMENTALParticipants will receive 1 dose of 20vPnC Vaccine.
Cohort 2EXPERIMENTALParticipants will receive 1 dose of 20vPnC Vaccine.
Cohort 3EXPERIMENTALParticipants will receive 2 doses of 20vPnC Vaccine on Day 1 (Vaccination 1) and 56 to 70 days after Vaccination 1 (Vaccination 2).
Cohort 4EXPERIMENTALParticipants will receive 3 doses of 20vPnC Vaccine on Day 1 (Vaccination 1), 28 to 56 days after Vaccination 1 (Vaccination 2), and at 365 to \<455 days of age and at least 56 days after Vaccination 2 (Vaccination 3).
Cohort 5EXPERIMENTALParticipants will receive 4 doses of 20vPnC Vaccine on Day 1 (Vaccination 1), 42 to 63 days after Vaccination 1 (Vaccination 2), 42 to 63 days after Vaccination 2 (Vaccination 3), and at 365 to \<455 days of age (Vaccination 4).
Cohort 6 (20vPnC)EXPERIMENTALParticipants will receive 4 doses of 20vPnC Vaccine on Day 1 (Vaccination 1), 42 to 63 days after Vaccination 1 (Vaccination 2), 42 to 63 days after Vaccination 2 (Vaccination 3), and at 365 to \<455 days of age (Vaccination 4).
Cohort 6 (13vPnC)ACTIVE_COMPARATORParticipants will receive 4 doses of 13vPnC Vaccine on Day 1 (Vaccination 1), 42 to 63 days after Vaccination 1 (Vaccination 2), 42 to 63 days after Vaccination 2 (Vaccination 3), and at 365 to \<455 days of age (Vaccination 4).

Interventions

NameTypeDescription
20vPnCBIOLOGICAL20vPnC vaccine
13vPnCBIOLOGICAL13vPnC vaccine
SalineOTHERSaline
PPSV23BIOLOGICALPneumococcal polysaccharide vaccine
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Eligibility Criteria

Age Range42 Days to 98 Days
SexALL
Healthy VolunteersYes
Study Sites4

Key Inclusion Criteria: \- Healthy male or female infants born at ≥37 weeks of gestation and who are approximately 2 months of age (≥42 to ≤98 days) at the time of consent (the day of birth is considered Day 1 of life) will be enrolled. Key Exclusion Criteria: * history of a severe adverse reacti...

Countries:ChinaJapanSouth KoreaTaiwanUnited StatesSweden
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Recent Changes (Last 90 Days)

LOWAug 11, 2026NCT07754539NEW_TRIAL: changed
LOWAug 11, 2026NCT07754539NEW_TRIAL: changed
LOWAug 11, 2026NCT07754539NEW_TRIAL: changed

Frequently asked questions about 20vPnC

What is 20vPnC used for?

20vPnC is an investigational vaccine being developed for the prevention of pneumococcal disease, including pneumococcal diseases caused by Streptococcus pneumoniae. It is being studied in adults, children, and infants across multiple clinical trials to evaluate its safety and immunogenicity.

Who makes 20vPnC?

20vPnC is being developed by Pfizer, Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol PFE. The company is conducting clinical trials to evaluate the vaccine's safety and effectiveness in preventing pneumococcal disease.

What phase is 20vPnC in?

20vPnC is in Phase 3 clinical development. It has completed a Phase 3 trial in pneumococcal vaccine-naive adults and is currently recruiting for a Phase 3 study in healthy Chinese infants. The vaccine remains investigational and has not been approved by regulatory authorities.

What clinical trials is 20vPnC in?

20vPnC is being studied in several clinical trials, including NCT03828617, a completed Phase 3 trial in adults; NCT07019909, a completed Phase 1 trial in Chinese adults; NCT07023081, an active Phase 1 trial in Chinese adults, children, and infants; and NCT07754539, a recruiting Phase 3 trial in Chinese infants.

Is 20vPnC the same as 13vPnC?

20vPnC and 13vPnC are different vaccines. A clinical trial (NCT07019909) is directly comparing the safety and effectiveness of 20vPnC and 13vPnC in Chinese adults, indicating they are distinct investigational products being evaluated for pneumococcal disease prevention.