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pneumococcal 23v polysaccharide vaccine

Phase 4

Pneumococcal Infection | Vaccine | Infectious Disease |Merck & Company, Inc.|Trials Updated: Jul 18, 2025

pneumococcal 23v polysaccharide vaccine development status

Highest phase Phase 4 run by National Institute of Allergy and Infectious Diseases (NIAID) (NCT00023504)
Phase scored for MRKPhase 3
Registered trials 6 across 3 sponsors since Sep 2001

pneumococcal 23v polysaccharide vaccine target and mechanism

ModalityVaccine

Also known as V110, PNEUMOVAX

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials3
Total Enrollment1,123

FDA Designations

No designations recorded

pneumococcal 23v polysaccharide vaccine clinical trials

pneumococcal 23v polysaccharide vaccine · 3 trials · 3 indications

Phase 3 3
NCT05158140Safety, Tolerability, and Immunogenicity of V110 or V114 Co-administered With a Booster Dose of mRNA-1273 in Healthy Adults (V110-911)Pneumococcal Infection
COMPLETED850 Analytics
NCT00560950Revaccination With PNEUMOVAX(TM) 23 in Older Adults (V110-007)Pneumococcal Infection
COMPLETED143 Analytics
NCT00127153A Study of V110 a Pneumococcal Vaccine in Healthy Adults (V110-013)Healthy
COMPLETED130 Analytics
PHASE3COMPLETED
Safety, Tolerability, and Immunogenicity of V110 or V114 Co-administered With a Booster Dose of mRNA-1273 in Healthy Adults (V110-911)
Pneumococcal InfectionUnlock trial analytics
PHASE3COMPLETED
Revaccination With PNEUMOVAX(TM) 23 in Older Adults (V110-007)
Pneumococcal InfectionUnlock trial analytics
PHASE3COMPLETED
A Study of V110 a Pneumococcal Vaccine in Healthy Adults (V110-013)
HealthyUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of Participants With Solicited Injection-Site Adverse Events (AEs) Among Participants Administered V110
Up to Day 7 After Any Vaccination (Up to Study Day 37)

An adverse event (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. Solicited injection-site AEs include redness, swelling, pain/tenderness, and underarm gland swelling or tenderness/lymphadenopathy at the injection site. The percentage of participants with one or more solicited injection-site AEs following any vaccination was reported.

Percentage of Participants With Solicited Injection-Site Adverse Events Among Participants Administered V114
Up to Day 7 After Any Vaccination (Up to Study Day 37)

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. Solicited injection-site AEs include redness, swelling, pain/tenderness, and underarm gland swelling or tenderness/lymphadenopathy at the injection site. The percentage of participants with one or more solicited injection-site AEs following any vaccination was reported.

Percentage of Participants With Solicited Systemic AEs Among Participants Administered V110
Up to Day 7 After Any Vaccination (Up to Study Day 37)

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. Systemic adverse events (AEs) include headache, tiredness/fatigue, muscle aches all over body/myalgia, joint pain/arthralgia, nausea, vomiting, and chills. The percentage of participants with solicited systemic AEs following any vaccination was reported.

Percentage of Participants With Solicited Systemic AEs Among Participants Administered V114
Up to Day 7 After Any Vaccination (Up to Study Day 37)

An AE is any untoward medical occurrence in a patient or clinical study participant, temporally associated with the use of study treatment, whether or not considered related to the study treatment. Systemic adverse events (AEs) include headache, tiredness/fatigue, muscle aches all over body/myalgia, joint pain/arthralgia, nausea, vomiting, and chills. The percentage of participants with solicited systemic AEs following any vaccination was reported.

Percentage of Participants With Vaccine-Related Serious AEs (SAEs) Among Participants Administered V110
Up to Month 6

Serious adverse events (SAEs) are defined as any untoward medical occurrence that, at any dose, results in death, is life threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, is a congenital anomaly/birth defect in offspring of a participant, or other important medical events. V110 vaccine-related SAEs as determined by investigator are summarized.

Percentage of Participants With Vaccine-Related SAEs Among Participants Administered V114
Up to Month 6

SAEs are defined as any untoward medical occurrence that, at any dose, results in death, is life threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, is a congenital anomaly/birth defect in offspring of a participant, or other important medical events. V114 vaccine-related SAEs as determined by investigator are summarized.

Serotype-specific Opsonophagocytic Activity (OPA) Geometric Mean Titer (GMT) in Participants Administered V110
Up to 30 days postvaccination with V110 (Study Day 30 for concomitant vaccination group, and Study Day 60 for nonconcomitant vaccination group, respectively)

Serotype-specific OPA GMTs for 14 of the serotypes contained in V110 were determined using a multiplexed opsonophagocytic assay (MOPA) at 30 days postvaccination with V110. The within-group 95% confidence intervals (CIs) were obtained by exponentiating the CIs of the mean of the natural log values based on the t-distribution.

Serotype-specific OPA GMT in Participants Administered V114
Up to 30 days postvaccination with V114 (Study Day 30 for concomitant vaccination group, and Study Day 60 for nonconcomitant vaccination group, respectively)

Serotype-specific OPA GMTs for 15 of the serotypes contained in V114 were determined using a MOPA at 30 days postvaccination with V114. The within-group 95% CIs were obtained by exponentiating the CIs of the mean of the natural log values based on the t-distribution.

SARS-CoV-2-specific Binding Antibody (bAb) GMT in Participants Administered Either V110 or V114
Up to 30 days postvaccination with mRNA-1273 (Study Day 30)

Sera from participants were used to measure vaccine-induced bAb responses using a validated ligand-binding assay specific to the SARS-CoV-2 Spike protein at 30 days post vaccination. The within-group 95% CIs were obtained by exponentiating the CIs of the mean of the natural log values based on the t-distribution. As prespecified by the protocol and statistical analysis plan, the V110 nonconcomitant group and V114 nonconcomitant group were combined for this analysis, as they shared the same administration for the first visit (mRNA-1273 and placebo).

Geometric Mean Concentration for Prevaccination (Day 1) to Postvaccination (Day 30) During the Extension Phase Subjects Completing the Extension for Serotype 3
Day 1 & Day 30

Blood drawn at Day 1 and Day 30 of the extension study were used to measure IgG antibody levels to 8 pneumococcal polysaccharide serotypes (3, 4, 6B,8, 9V, 12F, 14, 23F) by ELISA.

Geometric Mean Concentration for Prevaccination (Day 1) to Postvaccination (Day 30) During the Extension Phase Subjects Completing the Extension for Serotype 4
Day 1 & Day 30

Blood drawn at Day 1 and Day 30 of the extension study were used to measure IgG antibody levels to 8 pneumococcal polysaccharide serotypes (3, 4, 6B, 8, 9V, 12F, 14, 23F) by ELISA.

Geometric Mean Concentration for Prevaccination (Day 1) to Postvaccination (Day 30) During the Extension Phase Subjects Completing the Extension for Serotype 6B
Day 1 & Day 30

Blood drawn at Day 1 and Day 30 of the extension study were used to measure IgG antibody levels to 8 pneumococcal polysaccharide serotypes (3, 4, 6B, 8, 9V, 12F, 14, 23F) by ELISA.

Geometric Mean Concentration for Prevaccination (Day 1) to Postvaccination (Day 30) During the Extension Phase Subjects Completing the Extension for Serotype 8
Day 1 & Day 30

Blood drawn at Day 1 and Day 30 of the extension study were used to measure IgG antibody levels to 8 pneumococcal polysaccharide serotypes (3, 4, 6B, 8, 9V, 12F, 14, 23F) by ELISA.

Geometric Mean Concentration for Prevaccination (Day 1) to Postvaccination (Day 30) During the Extension Phase Subjects Completing the Extension for Serotype 9V
Day 1 & Day 30

Blood drawn at Day 1 and Day 30 of the extension study were used to measure IgG antibody levels to 8 pneumococcal polysaccharide serotypes (3, 4, 6B, 8, 9V, 12F, 14, 23F) by ELISA.

Geometric Mean Concentration for Prevaccination (Day 1) to Postvaccination (Day 30) During the Extension Phase Subjects Completing the Extension for Serotype 12F
Day 1 & Day 30

Blood drawn at Day 1 and Day 30 of the extension study were used to measure IgG antibody levels to 8 pneumococcal polysaccharide serotypes (3, 4, 6B, 8, 9V, 12F, 14, 23F) by ELISA.

Geometric Mean Concentration for Prevaccination (Day 1) to Postvaccination (Day 30) During the Extension Phase Subjects Completing the Extension for Serotype 14
Day 1 & Day 30

Blood drawn at Day 1 and Day 30 of the extension study were used to measure IgG antibody levels to 8 pneumococcal polysaccharide serotypes (3, 4, 6B, 8, 9V, 12F, 14, 23F) by ELISA.

Geometric Mean Concentration for Prevaccination (Day 1) to Postvaccination (Day 30) During the Extension Phase Subjects Completing the Extension for Serotype 23F
Day 1 & Day 30

Blood drawn at Day 1 and Day 30 of the extension study were used to measure IgG antibody levels to 8 pneumococcal polysaccharide serotypes (3, 4, 6B, 8, 9V, 12F, 14, 23F) by ELISA.

Immunogenicity

Secondary Endpoints

Serotype-specific OPA Geometric Mean Fold Rise (GMFR) in Participants Administered V110
Baseline and 30 days postvaccination with V110 (Study Day 1 and Study Day 30 for concomitant vaccination group, and Study Day 30 and Study Day 60 for nonconcomitant vaccination group, respectively)
Serotype-specific OPA GMFR in Participants Administered V114
Baseline and 30 days postvaccination with V114 (Study Day 1 and Study Day 30 for concomitant vaccination group, and Study Day 30 and Study Day 60 for nonconcomitant vaccination group, respectively)
SARS-CoV-2-specific Binding Antibody (bAb) GMFR in Participants Administered Either V110 or V114
Baseline and 30 days postvaccination with mRNA-1273 (Study Day 1 and Study Day 30, respectively)
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
V110 Concomitant with mRNA-1273 (V110 Concomitant)EXPERIMENTALParticipants received a single 0.5 mL intramuscular (IM) injection of V110 concomitantly with a single 0.25 mL IM injection of mRNA-1273 on Day 1, followed by a single 0.5 mL IM injection of placebo for V110 on Day 30.
V110 Nonconcomitant with mRNA-1273 (V110 Nonconcomitant)EXPERIMENTALParticipants received a single 0.5 mL IM injection of placebo for V110 on Day 1 concomitantly with a single 0.25 mL IM injection of mRNA-1273, followed by a single 0.5 mL IM injection of V110 on Day 30.
V114 Concomitant with mRNA-1273 (V114 Concomitant)EXPERIMENTALParticipants received a single 0.5 mL IM injection of V114 concomitantly with a single 0.25 mL IM injection of mRNA-1273 on Day 1, followed by a single 0.5 mL IM injection of placebo for V114 on Day 30.
V114 Nonconcomitant with mRNA-1273 (V114 Nonconcomitant)EXPERIMENTALParticipants received single 0.5 mL IM injection of placebo for V114 on Day 1 concomitantly with a single 0.25 mL IM injection of mRNA-1273, followed by a single 0.5 mL IM injection of V114 on Day 30.
1st Revaccination GroupEXPERIMENTAL -
2nd Revaccination GroupEXPERIMENTAL -

Interventions

NameTypeDescription
V110BIOLOGICALSingle intramuscular (IM) dose of 0.5 mL V110, a pneumococcal polysaccharide vaccine (PCV), containing the 23 serotypes: 1, 2, 3, 4, 5, 6B, 7F, 8, 9N, 9V, 10A, 11A, 12F, 14, 15B, 17F, 18C, 19A, 19F, 20, 22F, 23F, and 33F
V114BIOLOGICALSingle IM dose of 0.5 mL V114 a 15-valent PCV containing the 15 serotypes: 1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, 22F, 23F, 33F
mRNA-1273BIOLOGICALSingle IM dose of 50 μg/0.25 mL mRNA-1273
Placebo for V110BIOLOGICALSingle IM dose of 0.5 mL placebo for V110
Placebo for V114BIOLOGICALSingle IM dose of 0.5 mL placebo for V114
pneumococcal 23v polysaccharide vaccineBIOLOGICALDuration of Treatment: Single vaccination on Day 1
V110, pneumococcal vaccine polyvalentBIOLOGICAL -
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Eligibility Criteria

Age Range50 Years to N/A
SexALL
Healthy VolunteersYes
Study Sites46

Inclusion Criteria: * Is in good health * Any underlying chronic illness must be documented to be in stable condition * Has received a 2-dose primary series of the Moderna mRNA SARS-CoV-2 vaccine ≥5 months before receipt of study vaccine at Visit 1 * May have received either: a) A first booster dos...

Countries:United StatesPuerto Rico
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Frequently asked questions about pneumococcal 23v polysaccharide vaccine

What is pneumococcal 23v polysaccharide vaccine used for?

Pneumococcal 23v polysaccharide vaccine is used to prevent pneumococcal infection. It is a vaccine developed by Merck & Company, Inc. (MRK) and is studied in older adults, including revaccination of adults aged 59 years and older. It covers 23 pneumococcal serotypes as a polysaccharide vaccine.

Who makes the pneumococcal 23v polysaccharide vaccine?

The pneumococcal 23v polysaccharide vaccine is developed by Merck & Company, Inc., which trades under the ticker MRK. Merck is the sponsor of the clinical program studying this vaccine for pneumococcal infection.

What phase is the pneumococcal 23v polysaccharide vaccine in?

The pneumococcal 23v polysaccharide vaccine is in Phase 3 clinical development. One Phase 3 trial has been completed, and no active trials are currently listed. It is an investigational vaccine studied for pneumococcal infection, not a newly approved product based on this program.

What clinical trials is the pneumococcal 23v polysaccharide vaccine in?

The pneumococcal 23v polysaccharide vaccine has been studied in one completed Phase 3 trial, NCT00560950, titled Revaccination With PNEUMOVAX(TM) 23 in Older Adults (V110-007). That trial enrolled 143 participants aged 59 years and older, was controlled, and included healthy volunteers.

Is the pneumococcal 23v polysaccharide vaccine the same as PNEUMOVAX 23?

Yes, the pneumococcal 23v polysaccharide vaccine is also known as PNEUMOVAX 23, the name used in the completed Phase 3 revaccination trial NCT00560950 in older adults. Searches for either name refer to the same Merck vaccine candidate for pneumococcal infection.