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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT04382326
Other study ID # B7471011
Secondary ID 2019-003305-10
Status Completed
Phase Phase 3
First received
Last updated
Start date May 20, 2020
Est. completion date September 2, 2022

Study information

Verified date November 2023
Source Pfizer
Contact n/a
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

20-valent Pneumococcal Conjugate Vaccine Safety and Immunogenicity Study of a 4-Dose Series in Healthy Infants


Recruitment information / eligibility

Status Completed
Enrollment 1997
Est. completion date September 2, 2022
Est. primary completion date September 2, 2022
Accepts healthy volunteers Accepts Healthy Volunteers
Gender All
Age group 42 Days to 98 Days
Eligibility Inclusion Criteria: - Male or female infants born at >36 weeks of gestation and 2 months of age at the time of consent. - Healthy infants determined by clinical assessment, including medical history and clinical judgment, to be eligible for the study. Exclusion Criteria: - History of severe adverse reaction associated with a vaccine and/or severe allergic reaction (eg, anaphylaxis) - Major known congenital malformation or serious chronic disorder - Other acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with study participation or investigational product administration or may interfere with the interpretation of study results - Previous receipt of >1 dose of hepatitis B vaccine; or receipt of a single hepatitis B vaccine dose administered at >30 days old, or previous receipt of any licensed or investigational pneumococcal vaccine, or planned receipt through study participation

Study Design


Related Conditions & MeSH terms


Intervention

Biological:
20-valent pneumococcal conjugate vaccine
20-valent pneumococcal conjugate vaccine
13-valent pneumococcal conjugate vaccine
13-valent pneumococcal conjugate vaccine

Locations

Country Name City State
Puerto Rico Cooperativa de Facultad Medica Sanacoop DBA Instituto Sanacoop Bayamon
Puerto Rico Clinical Research Puerto Rico Guayama
Puerto Rico Hispanic Alliance for Clinical and Translational Research San Juan
Puerto Rico San Juan Hospital San Juan
Puerto Rico San Miguel Medical Trujillo Alto
United States Medpharmics Albuquerque New Mexico
United States Idaho Falls Pediatrics Ammon Idaho
United States The Iowa Clinic Ankeny Iowa
United States Children's Colorado Health Pavilion (Child Health Clinic) Aurora Colorado
United States Children's Hospital Colorado Aurora Colorado
United States University of Maryland, Baltimore, Center for Vaccine Development and Global Health Baltimore Maryland
United States Kentucky Pediatric/Adult Research Bardstown Kentucky
United States Velocity Clinical Research at Primary Pediatrics, Macon Baton Rouge Louisiana
United States Gardens Medical Center Bell Gardens California
United States Coast Clinical Research, LLC Bellflower California
United States Children's of Alabama Birmingham Alabama
United States UAB Pediatric Primary Care Clinic at Children's of Alabama Birmingham Alabama
United States Gentle Medicine Associates Boynton Beach Florida
United States Holston Medical Group Bristol Tennessee
United States SUNY Downstate Medical Center Brooklyn New York
United States Tekton Research, Inc Chamblee Georgia
United States Coastal Pediatric Research Charleston South Carolina
United States Pediatric Associates of Charlottesville, PLC Charlottesville Virginia
United States Pediatric Research of Charlottesville, LLC Charlottesville Virginia
United States Premier Medical Group Clarksville Tennessee
United States Optumcare Colorado Springs, LLC Colorado Springs Colorado
United States Optumcare Colorado Springs, LLC Colorado Springs Colorado
United States Columbus Regional Research Institute Columbus Georgia
United States Uptown Pediatrics Columbus Georgia
United States Coastal Bend Clinical Research Corpus Christi Texas
United States Priti Desai, M.D. Inc. Covina California
United States Benchmark Research Covington Louisiana
United States Dayton Clinical Research Dayton Ohio
United States Ohio Pediatric Research Association, Inc. Dayton Ohio
United States Blank Children's Pediatric Clinic Des Moines Iowa
United States Unity Point Health Des Moines Iowa
United States Southeastern Pediatric Associates Dothan Alabama
United States Pediatric Medical Associates East Norriton Pennsylvania
United States Child Health Care Associates East Syracuse New York
United States Alliance for Multispecialty Research, LLC El Dorado Kansas
United States Allegheny Health and Wellness Pavilion Erie Pennsylvania
United States Pediatric Associates of Fairfield Fairfield Ohio
United States Northwest Arkansas Pediatrics Fayetteville Arkansas
United States Lockman & Lubell Pediatric Associates Fort Washington Pennsylvania
United States The Pediatric Center of Frederick, LLC Frederick Maryland
United States Universal Biopharma Research Institute Inc. Fresno California
United States Benton Pediatrics Gainesville Florida
United States Sarkis Clinical Trials Gainesville Florida
United States Matrix Clinical Research Gardena California
United States ECU Physicians Adult and Pediatric Health Center Greenville North Carolina
United States ECU Physicians Pediatric Outpatient Clinic Greenville North Carolina
United States Leo Jenkins Cancer Center Pharmacy Greenville North Carolina
United States MedPharmics, LLC Gulfport Mississippi
United States Meridian Clinical Research Hastings Nebraska
United States ACC Pediatric Research Haughton Louisiana
United States Advanced Investigative Medicine, Inc. Hawthorne California
United States Qway Research Hialeah Florida
United States Next Phase Research Alliance Homestead Florida
United States Houston Clinical Research Associates Houston Texas
United States Kool Kids Pediatrics Houston Texas
United States La Providence Pediatrics Clinic Houston Texas
United States Clinical Research Prime Idaho Falls Idaho
United States Family First Medical Center Idaho Falls Idaho
United States Idaho Falls Pediatrics Idaho Falls Idaho
United States Snake River Research, PLLC Idaho Falls Idaho
United States The Pediatric Center Idaho Falls Idaho
United States Smart Medical Research, Inc Jackson Heights New York
United States The Children's Clinic of Jonesboro, P.A. Jonesboro Arkansas
United States Wee Care Pediatrics Kaysville Utah
United States Holston Medical Group Kingsport Tennessee
United States Wee Care Pediatrics Layton Utah
United States Michael W. Simon, MD, PSC Lexington Kentucky
United States Midwest Children's Health Research Institute Lincoln Nebraska
United States Midwest Children's Health Research Institute Lincoln Nebraska
United States Child Health Care Associates Liverpool New York
United States DCOL Center for Clinical Research Longview Texas
United States Diagnostic Clinic of Longview Longview Texas
United States Brownsboro Park Pediatrics Louisville Kentucky
United States Novak Center for Children's Health Louisville Kentucky
United States Axcess Medical Research Loxahatchee Groves Florida
United States Meridian Clinical Research Macon Georgia
United States Ashley Pediatrics Day and Night Clinic McAllen Texas
United States Dr. Ruben Aleman & Associates McAllen Texas
United States LeBonheur Children's Hospital Memphis Tennessee
United States Velocity Clinical Research, Covington Metairie Louisiana
United States Acevedo Clinical Research Associates Miami Florida
United States Bio-Medical Research, LLC Miami Florida
United States Suncoast Research Associates, LLC Miami Florida
United States Crystal Biomedical Research, LLC Miami Lakes Florida
United States Boeson Research Missoula Montana
United States Wasatch Pediatrics, Cottonwood Office Murray Utah
United States ASR, LLC Nampa Idaho
United States Saltzer Health Nampa Idaho
United States Palmetto Pediatrics, PA North Charleston South Carolina
United States Kaiser Permanente Oakland Oakland California
United States Children's Physicians Dundee Omaha Nebraska
United States Orange County Research Institute Ontario California
United States MedPharmics, LLC Phoenix Arizona
United States Omega Pediatrics Roswell Georgia
United States Wee Care Pediatrics Roy Utah
United States Dixie Pediatrics Saint George Utah
United States Tekton Research, Inc San Antonio Texas
United States Sanford 69th & Louise Family Medicine Sioux Falls South Dakota
United States Sanford Children's Specialty Clinic Sioux Falls South Dakota
United States Senders Pediatrics South Euclid Ohio
United States Wee Care Pediatrics Syracuse Utah
United States Children's Health Center Tampa Florida
United States The Vancouver Clinic, Inc Vancouver Washington
United States Center for Clinical Trials of San Gabriel West Covina California
United States The Iowa Clinic West Des Moines Iowa

Sponsors (1)

Lead Sponsor Collaborator
Pfizer

Countries where clinical trial is conducted

United States,  Puerto Rico, 

Outcome

Type Measure Description Time frame Safety issue
Primary Percentage of Participants With Local Reactions Within 7 Days After Dose 1 Local reactions were recorded using an electronic diary. Local reactions included redness, swelling and pain at the injection site. Redness and swelling were graded as mild (0.5 to 2.0 cm), moderate (>2.0 to 7.0 cm) and severe (>7.0 cm). Pain at injection site was graded as mild (hurt if gently touched example, whimpered, winced, protested, or withdrew), moderate (hurt if gently touched, with crying), and severe (caused limitation of limb movement). Within 7 days after Dose 1
Primary Percentage of Participants With Local Reaction Within 7 Days After Dose 2 Local reactions were recorded using an electronic diary. Local reactions included redness, swelling and pain at the injection site. Redness and swelling were graded as mild (0.5 to 2.0 cm), moderate (>2.0 to 7.0 cm) and severe (>7.0 cm). Pain at injection site was graded as mild (hurt if gently touched example, whimpered, winced, protested, or withdrew), moderate (hurt if gently touched, with crying), and severe (caused limitation of limb movement). Within 7 Days After Dose 2
Primary Percentage of Participants With Local Reactions Within 7 Days After Dose 3 Local reactions were recorded using an electronic diary. Local reactions included redness, swelling and pain at the injection site. Redness and swelling were graded as mild (0.5 to 2.0 cm), moderate (>2.0 to 7.0 cm) and severe (>7.0 cm). Pain at injection site was graded as mild (hurt if gently touched example, whimpered, winced, protested, or withdrew), moderate (hurt if gently touched, with crying), and severe (caused limitation of limb movement). Within 7 days after Dose 3
Primary Percentage of Participants With Local Reactions Within 7 Days After Dose 4 Local reactions were recorded using an electronic diary. Local reactions included redness, swelling and pain at the injection site. Redness and swelling were graded as mild (0.5 to 2.0 cm), moderate (>2.0 to 7.0 cm) and severe (>7.0 cm). Pain at injection site was graded as mild (hurt if gently touched example, whimpered, winced, protested, or withdrew), moderate (hurt if gently touched, with crying), and severe (caused limitation of limb movement). 95 percent (%) confidence interval (CI) was based on Clopper and Pearson method. Within 7 days after Dose 4
Primary Percentage of Participants With Systemic Events Within 7 Days After Dose 1 Systemic events 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 greater than or equal to (>=) 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 was 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. Within 7 days after Dose 1
Primary Percentage of Participants With Systemic Events Within 7 Days After Dose 2 Systemic events 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 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 was 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. Within 7 days after Dose 2
Primary Percentage of Participants With Systemic Events Within 7 Days After Dose 3 Systemic events 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 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 was 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. Within 7 days after Dose 3
Primary Percentage of Participants With Systemic Events Within 7 Days After Dose 4 Systemic events 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 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 was 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. Within 7 days after Dose 4
Primary Percentage of Participants With Adverse Events (AEs) From Dose 1 to 1 Month After Dose 3 An AE was any untoward medical occurrence in a participants, 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. AEs reported in this outcome measure excluded local reactions and systemic events. From Dose 1 to 1 Month after Dose 3
Primary Percentage of Participants With AEs From Dose 4 to 1 Month After Dose 4 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. AEs reported in this outcome measure excluded local reactions and systemic events. From Dose 4 to 1 month after Dose 4
Primary Percentage of Participants With Serious Adverse Events (SAEs) From Dose 1 to 6 Months Following Dose 4 A SAE was any untoward medical occurrence that, at any dose: resulted in death; required inpatient hospitalisation or prolongation of existing hospitalisation; was life-threatening; resulted in persistent or significant disability/ incapacity; congenital anomaly/birth defect and other important medical events. 95% CI was based on the Clopper and Pearson method. From Dose 1 to 6 months following Dose 4
Primary Percentage of Participants With Newly Diagnosed Chronic Medical Conditions (NDCMCs) From Dose 1 to 6 Months Following Dose 4 An NDCMC was defined as a significant 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. From Dose 1 to 6 months following Dose 4
Primary Percentage of Participants With Predefined Serotype-specific Immunoglobulin G (IgG) Concentrations 1 Month After Dose 3 Pre-specified levels of serotypes were as follows: for serotype 1, 3, 4, 6A, 7F, 9V, 14, 18C, 19F, 23F, 8, 10A, 11A, 12F, 15B, 22F, 33F: >=0.35 microgram per mL (mcg/mL), for serotype 5: >=0.23 mcg/mL, for serotype 6B: >=0.10 mcg/mL and for serotype 19A: >=0.12 mcg/mL. 95% CI was based on the Clopper and Pearson method. 1 month after Dose 3
Primary Serotype-specific IgG Geometric Mean Concentration (GMCs) and Geometric Mean Ratios (GMRs) at 1 Month After Dose 4 Concentrations of anticapsular IgG for the 20 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, 23F, 8, 10A, 11A, 12F, 15B, 22F, and 33F) were determined in all participants at 1 month after Dose 4 using the Luminex assay. Results were expressed as IgG concentrations. GMCs and 2-sided CIs were calculated by exponentiating the mean logarithm of the concentrations and the corresponding CIs based on the Student's t distribution. Assay result below LLOQ was set to 0.5*LLOQ. Geometric mean ratios (GMRs) were reported in statistical analysis section and were calculated by exponentiating mean difference of logarithm of concentration and corresponding 2-sided 95% CIs (based on Student's t distribution). From Dose 1 to 6 months following Dose 4
Primary Percentage of Participants With Prespecified Antibody Levels to Specific Concomitant Vaccine Antigens 1 Month After Dose 3 Concentration of antibody to diphtheria toxoid (predefined level =0.1 IU/mL), tetanus toxoid (predefined level =0.1 IU/mL), IgG antibodies to pertussis antigens (pertussis toxin, filamentous hemagglutinin and pertactin, each with the predefined level as the 5th percentile observed in the 13vPnC group), hepatitis B antibody (in milli-international units per mL [mIU/mL]) (predefined level =10 mIU/mL), neutralizing antibody (NA) titers to poliovirus types 1, 2, and 3 (predefined level NA titer =1:8), Haemophilus influenzae type b (Hib) (=0.15 µg/mL) were determined on subsets of sera collected at the immunogenicity time point 1 month after Dose 3. The antibody levels were measured by a validated multiplex Luminex immunoassay. The concomitant immune responses were measured on random subsets. 1 month after Dose 3
Secondary Serotype-specific IgG GMCs and GMRs at 1 Month After Dose 3 Pneumococcal IgG antibody against each of the 20 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, 23F, 8, 10A, 11A, 12F, 15B, 22F and 33F) was measured using direct binding Luminex assay. Results were expressed as IgG concentrations. GMCs and 2-sided CIs were calculated by exponentiating the mean logarithm of the concentrations and the corresponding CIs based on the Student's t distribution. Assay result below LLOQ were set to 0.5*LLOQ.GMRs were reported in statistical analysis section and were calculated by exponentiating mean difference of logarithm of concentration and corresponding 2-sided 95% CI (based on Student's t distribution). Assay result below LLOQ were set to 0.5*LLOQ.GMRs were reported in statistical analysis section and were calculated by exponentiating mean difference of logarithm of concentration and corresponding 2-sided 95% CI (based on Student's t distribution). 1 month after Dose 3
Secondary Percentage of Participants With Predefined IgG Concentrations 1 Month After Dose 4 Pre-specified levels of serotypes were as follows: for serotype 1, 3, 4, 6A, 7F, 9V, 14, 18C, 19F, 23F, 8, 10A, 11A, 12F, 15B, 22F, 33F: >=0.35 microgram per mL (mcg/mL), for serotype 5: >=0.23 mcg/mL, for serotype 6B: >=0.10 mcg/mL and for serotype 19A: >=0.12 mcg/mL. 95% CI was based on the Clopper and Pearson method. 1 month after Dose 4
Secondary Serotype-Specific Opsonophagocytic Activity (OPA) Geometric Mean Titers (GMTs) at 1 Month After Dose 3 OPA titers for the 20 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, 23F, 8, 10A, 11A, 12F, 15B, 22F, and 33F) were determined in randomized subsets of participants at 1 month after Dose 3. Results were expressed as OPA titers. GMTs and 2-sided CIs were calculated by exponentiating the mean logarithm of the concentrations and the corresponding CIs based on the Student's t distribution. OPA titers were determined in randomized subsets of participants at 1 month after Dose 3. 1 month after Dose 3
Secondary Serotype-specific OPA GMTs at 1 Month After Dose 4 OPA titers for the 20 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F, 23F, 8, 10A, 11A, 12F, 15B, 22F, and 33F) were determined in randomized subsets of participants at 1 month after Dose 4. Results were expressed as OPA titers. GMTs and 2-sided CIs were calculated by exponentiating the mean logarithm of the concentrations and the corresponding CIs based on the Student's t distribution. OPA titers were determined in randomized subsets of participants at 1 month after Dose 4. 1 month after Dose 4
Secondary Serotype-specific IgG Geometric Mean Fold Rise (GMFRs) From 1 Month After Dose 3 to Before Dose 4 GMFR of pneumococcal 20vPnC serotypes included: 1, 3, 4, 5, 6A, 6B, 7F, 8, 9V, 10A, 11A, 12F, 14, 15B, 18C, 19A, 19F, 22F, 23F and 33F. The GMFR from 1 month after Dose 3 to before Dose 4 were reported from Dose 3 evaluable immunogenicity participant. 1 month after Dose 3 to before Dose 4
Secondary Serotype-specific IgG GMFRs From 1 Month Before to 1 Month After Dose 4 GMFR of pneumococcal 20vPnC serotypes included: 1, 3, 4, 5, 6A, 6B, 7F, 8, 9V, 10A, 11A, 12F, 14, 15B, 18C, 19A, 19F, 22F, 23F and 33F. The GMFR from 1 month before Dose 4 to 1 month after Dose 4 were reported from Dose 4 evaluable immunogenicity participants. From 1 month before to 1 month after Dose 4
Secondary Serotype-specific IgG GMFRs From 1 Month After Dose 3 to 1 Month After Dose 4 GMFR of pneumococcal 20vPnC serotypes included: 1, 3, 4, 5, 6A, 6B, 7F, 8, 9V, 10A, 11A, 12F, 14, 15B, 18C, 19A, 19F, 22F, 23F and 33F. The GMFR from 1 month after Dose 3 to 1 month after Dose 4 were reported from participants in both Dose 3 and Dose 4 evaluable immunogenicity populations. from 1 month after Dose 3 to 1 month after Dose 4
Secondary Percentage of Participants With Alternative Prespecified Hib Antibody Level 1 Month After Dose 3 Antibody concentration to the Hib vaccine antigens were determined on sera collected from a randomly selected subset of participants with sufficient sera volumes. Percentage of participants with alternative prespecified Hib antibody (=1.0 µg/mL) were reported from Dose 3 evaluable immunogenicity participants. 1 month after Dose 3
Secondary Geometric Mean Ratios (GMRs) of Prespecified Antibody Levels to Specific Concomitant Vaccine Antigen (Measles) 1 Month After Dose 4 Antibody concentrations to concomitant vaccine antigen (measles) were determined on sera collected 1 month after Dose 4 from a randomly selected subset of participants with sufficient sera volumes. GMs and 2-sided CIs were calculated by exponentiating the mean logarithm of the concentrations and the corresponding CIs based on the Student's t distribution and were reported from Dose 4 evaluable immunogenicity participants. 1 month after Dose 4
Secondary GMRs of Prespecified Antibody Levels to Specific Concomitant Vaccine Antigen (Mumps) 1 Month After Dose 4 Antibody concentrations to concomitant vaccine antigen (mumps) were determined on sera collected 1 month after Dose 4 from a randomly selected subset of participants with sufficient sera volumes. GMs and 2-sided CIs were calculated by exponentiating the mean logarithm of the concentrations and the corresponding CIs based on the Student's t distribution and were reported from Dose 4 evaluable immunogenicity participants. 1 month after Dose 4
Secondary GMRs of Prespecified Antibody Levels to Specific Concomitant Vaccine Antigens (Rubella) 1 Month After Dose 4 Antibody concentrations to concomitant vaccine antigen (rubella) were determined on sera collected 1 month after Dose 4 from a randomly selected subset of participants with sufficient sera volumes. GMs and 2-sided CIs were calculated by exponentiating the mean logarithm of the concentrations and the corresponding CIs based on the Student's t distribution and were reported from Dose 4 evaluable immunogenicity participants. 1 month after Dose 4
Secondary GMRs of Prespecified Antibody Levels to Specific Concomitant Vaccine Antigen (Varicella) 1 Month After Dose 4 Antibody concentrations to concomitant vaccine antigen (varicella) were determined on sera collected 1 month after Dose 4 from a randomly selected subset of participants with sufficient sera volumes. GMs and 2-sided CIs were calculated by exponentiating the mean logarithm of the concentrations and the corresponding CIs based on the Student's t distribution and were reported from Dose 4 evaluable immunogenicity participants. 1 month after Dose 4
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