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A Study to Assess the Immunogenicity and Safety of GSK Biologicals' Infanrix-IPV/Hib Vaccine Administered as a Three-dose Vaccination Course at 3, 4.5 and 6 Months of Age and a Booster Dose at 18 Months of Age in Healthy Infants in Russia

Primary Purpose

Diphtheria, Tetanus, Pertussis

Status
Completed
Phase
Phase 3
Locations
Russian Federation
Study Type
Interventional
Intervention
Infanrix-IPV/Hib
Sponsored by
GlaxoSmithKline
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional prevention trial for Diphtheria focused on measuring Primary dose, Reactogenicity, Immunogenicity, Booster dose, Combined vaccine, Russian Infants, Infanrix®-IPV/Hib

Eligibility Criteria

3 Months - 19 Months (Child)All SexesAccepts Healthy Volunteers

Inclusion Criteria:

  • Subjects' parent(s)/Legally Acceptable Representatives [LARs] who, in the opinion of the investigator, can and will comply with the requirements of the protocol.
  • A male or female child between 3 and 4 months of age at the time of the first vaccination.
  • Written informed consent obtained from the parents/LARs of the subject prior to performing any study specific procedure.
  • Healthy subjects as established by medical history and clinical examination before entering into the study.
  • Born full-term.

Exclusion Criteria:

  • Child in care
  • Use of any investigational or non-registered product other than the study vaccine during the period starting 30 days before the first dose of study vaccine, or planned use during the study period.
  • Any medical condition that in the judgment of the investigator would make intramuscular injection unsafe.
  • Chronic administration of immunosuppressants or other immune-modifying drugs during the period starting since birth. For corticosteroids, this will mean prednisone ≥ 0.5 mg/kg/day, or equivalent. Inhaled and topical steroids are allowed.
  • Administration of long-acting immune-modifying drugs at any time during the study period
  • Planned administration/administration of a vaccine not foreseen by the study protocol in the period starting 30 days before the first dose and ending 30 days after the last dose of vaccine administration, with the exception of hepatitis B and other vaccines given as part of the national immunisation schedule and as part of routine vaccination practice, that are allowed at any time during the study period. Seasonal or pandemic influenza vaccine can be given at any time during the study, and according to the Summary of Product Characteristics and national recommendations.
  • Concurrently participating in another clinical study, at any time during the study period, in which the subject has been or will be exposed to an investigational or a non-investigational vaccine/product
  • Previous vaccination against diphtheria, tetanus, pertussis, poliomyelitis and Hib diseases.
  • History of diphtheria, tetanus, pertussis, poliomyelitis and Hib diseases.
  • Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination.
  • Family history of congenital or hereditary immunodeficiency.
  • History of any reaction or hypersensitivity likely to be exacerbated by any component of the vaccine.
  • Major congenital defects.
  • Serious chronic illness.
  • History of any neurological disorders or seizures.
  • Acute disease and/or fever at the time of enrolment.

    • Fever is defined as temperature ≥37.5°C for oral, axillary or tympanic route, or ≥38.0°C for rectal route.
    • Subjects with a minor illness without fever may be enrolled at the discretion of the investigator.
  • Administration of immunoglobulins and/or any blood products since birth or planned administration during the study period.

Sites / Locations

  • GSK Investigational Site
  • GSK Investigational Site
  • GSK Investigational Site
  • GSK Investigational Site
  • GSK Investigational Site

Arms of the Study

Arm 1

Arm Type

Experimental

Arm Label

DTPa-IPV/Hib Group

Arm Description

All subjects receive three doses of primary vaccination of the study vaccine, Infanrix-IPV/Hib (DTPa-IPV/Hib), at 3, 4.5 and 6 months of age and a single dose of booster vaccination at 18 months of age. The vaccine is administered intramuscularly into the upper side of the thigh on the right/left side.

Outcomes

Primary Outcome Measures

Number of Seroprotected Subjects for Anti-diphtheria (Anti-D) and Anti-tetanus (Anti-T), Post Primary Vaccination
A seroprotected subject is a subject whose anti-D and anti-T antibody concentration was greater than or equal to (≥) 0.1 International Units per milliliter (IU/mL).
Number of Seroprotected Subjects for Anti-poliovirus Types 1, 2 and 3, Post Primary Vaccination
A seroprotected subject is a subject whose anti-poliovirus types 1, 2 and 3 antibody titer was ≥ 8 ED50.
Number of Seroprotected Subjects for Anti-polyribosyl Ribitol Phosphate (Anti-PRP), Post Primary Vaccination
A seroprotected subject is a subject whose anti-PRP antibody concentration was ≥ 0.15 micrograms per milliliter (µg/mL).
Number of Seropositive Subjects for Anti-pertussis (Anti- PT), Anti-filamentous Haemagglutinin (Anti-FHA) and Anti-pertactin (Anti-PRN), Post Primary Vaccination
A seropositive subject is a subject whose antibody concentration was ≥ 2.046 IU/mL for anti-FHA, ≥ 2.187 IU/mL for anti-PRN and ≥ 2.693 IU/mL for anti-PT.

Secondary Outcome Measures

Number of Seroprotected Subjects for Anti-D and Anti-T, Post Booster Vaccination
A seroprotected subject is a subject whose anti-D and anti-T antibody concentration was ≥ 0.1 IU/mL.
Number of Seroprotected Subjects for Anti-poliovirus Types 1, 2 and 3, Post Booster Vaccination
A seroprotected subject is a subject whose anti-poliovirus types 1, 2 and 3 antibody titer was ≥ 8 ED50.
Number of Seroprotected Subjects for Anti-PRP, Post Booster Vaccination
A seroprotected subject is a subject whose anti-PRP antibody concentration was ≥ 0.15 µg/mL.
Number of Seropositive Subjects for Anti- PT, Anti-FHA and Anti-PRN, Post Booster Vaccination
A seropositive subject is a subject whose antibody concentration was ≥ 2.046 IU/mL for anti-FHA, ≥ 2.187 IU/mL for anti-PRN and ≥ 2.693 IU/mL for anti-PT.
Antibody Concentrations for Anti-D and Anti-T, Post Primary Vaccination
The antibody concentrations for anti-D and anti-T were presented as geometric mean concentrations (GMCs) and expressed as IU/mL.
Antibody Concentrations for Anti-D and Anti-T, Post Booster Vaccination
The antibody concentrations for anti-D and anti-T were presented as geometric mean concentrations (GMCs) and expressed as IU/mL.
Antibody Titers for Anti-polio Types 1, 2 and 3, Post Primary Vaccination
The antibody titers for anti-polio types 1, 2 and 3 were presented as geometric mean titres (GMTs).
Antibody Titers for Anti-polio Types 1, 2 and 3, Post Booster Vaccination
The antibody titers for anti-polio types 1, 2 and 3 were presented as geometric mean titres (GMTs).
Antibody Concentration for Anti-PRP, Post Primary Vaccination
The antibody concentrations for anti-PRP were presented as geometric mean concentrations (GMCs) and expressed as µg/mL.
Antibody Concentration for Anti-PRP, Post Booster Vaccination
The antibody concentrations for anti-PRP were presented as geometric mean concentrations (GMCs) and expressed as µg/mL.
Antibody Concentrations for Anti-PT, Anti-FHA and Anti-PRN, Post Primary Vaccination
The antibody concentrations for anti-PT, anti-FHA and anti-PRN were presented as GMCs and expressed as IU/mL.
Antibody Concentrations for Anti-PT, Anti-FHA and Anti-PRN, Post Booster Vaccination
The antibody concentrations for anti-PT, anti-FHA and anti-PRN were presented as GMCs and expressed as IU/mL.
Number of Subjects With Any Solicited Local Adverse Events (AEs) Following Each Dose of Primary Vaccination
The solicited local AEs assessed were pain, redness and swelling at injection site. Any = Occurrence of the AE regardless of the intensity grade.
Number of Subjects With Any Solicited Local AEs Following Booster Vaccination
The solicited local AEs assessed were pain, redness and swelling at injection site. Any = Occurrence of the AE regardless of the intensity grade.
Number of Subjects With Any Solicited General AEs Following Each Dose of Primary Vaccination
The solicited general AEs assessed were drowsiness, irritability/fussiness, loss of appetite and fever. Any = Occurrence of the AE regardless of the intensity grade. Any fever = Fever (axillary) ≥ 37.5°C.
Number of Subjects With Any Solicited General AEs Following Booster Vaccination
The solicited general AEs assessed were drowsiness, irritability/fussiness, loss of appetite and fever. Any = Occurrence of the AE regardless of the intensity grade. Any fever = Fever (axillary) ≥ 37.5°C.
Number of Subjects With Unsolicited AEs Following Each Dose of Primary Vaccination
An unsolicited AE was defined as any AE reported in addition to those solicited during the clinical study and any solicited AE with onset outside the specified period of follow-up for solicited AEs. Any = Occurrence of the AE regardless of the intensity grade.
Number of Subjects With Unsolicited AEs Following Booster Vaccination
An unsolicited AE was defined as any AE reported in addition to those solicited during the clinical study and any solicited AE with onset outside the specified period of follow-up for solicited AEs. Any = Occurrence of the AE regardless of the intensity grade.
Number of Subjects With Serious Adverse Events (SAEs)
The SAEs assessed included any untoward medical occurrences that resulted in death, were life threatening, required hospitalisation or prolongation of existing hospitalisation or resulted in disability/incapacity. Any = Occurrence of the AE regardless of the intensity grade.

Full Information

First Posted
July 29, 2016
Last Updated
September 12, 2019
Sponsor
GlaxoSmithKline
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1. Study Identification

Unique Protocol Identification Number
NCT02858440
Brief Title
A Study to Assess the Immunogenicity and Safety of GSK Biologicals' Infanrix-IPV/Hib Vaccine Administered as a Three-dose Vaccination Course at 3, 4.5 and 6 Months of Age and a Booster Dose at 18 Months of Age in Healthy Infants in Russia
Official Title
Immunogenicity and Safety of GSK Biologicals' Combined Diphtheria-tetanus-acellular Pertussis-inactivated Poliovirus and Haemophilus Influenzae Type b (DTPa-IPV/Hib) Conjugate Vaccine
Study Type
Interventional

2. Study Status

Record Verification Date
September 2019
Overall Recruitment Status
Completed
Study Start Date
September 13, 2016 (Actual)
Primary Completion Date
October 24, 2017 (Actual)
Study Completion Date
November 13, 2018 (Actual)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Sponsor
Name of the Sponsor
GlaxoSmithKline

4. Oversight

5. Study Description

Brief Summary
The purpose of this study is to evaluate the immune response, safety and reactogenicity after receiving combined DTPa-IPV/Hib vaccine when administered as a three-dose primary vaccination course at 3, 4.5 and 6 months of age and as a booster dose at 18 months of age in Russian healthy children according to the Russian immunisation schedule

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Diphtheria, Tetanus, Pertussis, Hepatitis B, Haemophilus Influenzae Type b
Keywords
Primary dose, Reactogenicity, Immunogenicity, Booster dose, Combined vaccine, Russian Infants, Infanrix®-IPV/Hib

7. Study Design

Primary Purpose
Prevention
Study Phase
Phase 3
Interventional Study Model
Single Group Assignment
Masking
None (Open Label)
Allocation
N/A
Enrollment
235 (Actual)

8. Arms, Groups, and Interventions

Arm Title
DTPa-IPV/Hib Group
Arm Type
Experimental
Arm Description
All subjects receive three doses of primary vaccination of the study vaccine, Infanrix-IPV/Hib (DTPa-IPV/Hib), at 3, 4.5 and 6 months of age and a single dose of booster vaccination at 18 months of age. The vaccine is administered intramuscularly into the upper side of the thigh on the right/left side.
Intervention Type
Biological
Intervention Name(s)
Infanrix-IPV/Hib
Intervention Description
Subjects receive Infanrix-IPV/Hib three-dose primary vaccination course at 3, 4.5 and 6 months of age and a booster dose at 18 months of age. The vaccine is administered intramuscularly into the upper side of the thigh on the right/left side.
Primary Outcome Measure Information:
Title
Number of Seroprotected Subjects for Anti-diphtheria (Anti-D) and Anti-tetanus (Anti-T), Post Primary Vaccination
Description
A seroprotected subject is a subject whose anti-D and anti-T antibody concentration was greater than or equal to (≥) 0.1 International Units per milliliter (IU/mL).
Time Frame
At Month 4 (i.e. one month after 3rd dose of primary vaccination)
Title
Number of Seroprotected Subjects for Anti-poliovirus Types 1, 2 and 3, Post Primary Vaccination
Description
A seroprotected subject is a subject whose anti-poliovirus types 1, 2 and 3 antibody titer was ≥ 8 ED50.
Time Frame
At Month 4 (i.e. one month after 3rd dose of primary vaccination)
Title
Number of Seroprotected Subjects for Anti-polyribosyl Ribitol Phosphate (Anti-PRP), Post Primary Vaccination
Description
A seroprotected subject is a subject whose anti-PRP antibody concentration was ≥ 0.15 micrograms per milliliter (µg/mL).
Time Frame
At Month 4 (i.e. one month after 3rd dose of primary vaccination)
Title
Number of Seropositive Subjects for Anti-pertussis (Anti- PT), Anti-filamentous Haemagglutinin (Anti-FHA) and Anti-pertactin (Anti-PRN), Post Primary Vaccination
Description
A seropositive subject is a subject whose antibody concentration was ≥ 2.046 IU/mL for anti-FHA, ≥ 2.187 IU/mL for anti-PRN and ≥ 2.693 IU/mL for anti-PT.
Time Frame
At Month 4 (i.e. one month after 3rd dose of primary vaccination)
Secondary Outcome Measure Information:
Title
Number of Seroprotected Subjects for Anti-D and Anti-T, Post Booster Vaccination
Description
A seroprotected subject is a subject whose anti-D and anti-T antibody concentration was ≥ 0.1 IU/mL.
Time Frame
At Month 16 (i.e. one month after booster vaccination)
Title
Number of Seroprotected Subjects for Anti-poliovirus Types 1, 2 and 3, Post Booster Vaccination
Description
A seroprotected subject is a subject whose anti-poliovirus types 1, 2 and 3 antibody titer was ≥ 8 ED50.
Time Frame
At Month 16 (i.e. one month after booster vaccination)
Title
Number of Seroprotected Subjects for Anti-PRP, Post Booster Vaccination
Description
A seroprotected subject is a subject whose anti-PRP antibody concentration was ≥ 0.15 µg/mL.
Time Frame
At Month 16 (i.e. one month after booster vaccination)
Title
Number of Seropositive Subjects for Anti- PT, Anti-FHA and Anti-PRN, Post Booster Vaccination
Description
A seropositive subject is a subject whose antibody concentration was ≥ 2.046 IU/mL for anti-FHA, ≥ 2.187 IU/mL for anti-PRN and ≥ 2.693 IU/mL for anti-PT.
Time Frame
At Month 16 (i.e. one month after booster vaccination)
Title
Antibody Concentrations for Anti-D and Anti-T, Post Primary Vaccination
Description
The antibody concentrations for anti-D and anti-T were presented as geometric mean concentrations (GMCs) and expressed as IU/mL.
Time Frame
At Month 4 (i.e. one month after 3rd dose of primary vaccination)
Title
Antibody Concentrations for Anti-D and Anti-T, Post Booster Vaccination
Description
The antibody concentrations for anti-D and anti-T were presented as geometric mean concentrations (GMCs) and expressed as IU/mL.
Time Frame
At Month 16 (i.e. one month after booster vaccination)
Title
Antibody Titers for Anti-polio Types 1, 2 and 3, Post Primary Vaccination
Description
The antibody titers for anti-polio types 1, 2 and 3 were presented as geometric mean titres (GMTs).
Time Frame
At Month 4 (i.e. one month after 3rd dose of primary vaccination)
Title
Antibody Titers for Anti-polio Types 1, 2 and 3, Post Booster Vaccination
Description
The antibody titers for anti-polio types 1, 2 and 3 were presented as geometric mean titres (GMTs).
Time Frame
At Month 16 (i.e. one month after booster vaccination)
Title
Antibody Concentration for Anti-PRP, Post Primary Vaccination
Description
The antibody concentrations for anti-PRP were presented as geometric mean concentrations (GMCs) and expressed as µg/mL.
Time Frame
At Month 4 (i.e. one month after 3rd dose of primary vaccination)
Title
Antibody Concentration for Anti-PRP, Post Booster Vaccination
Description
The antibody concentrations for anti-PRP were presented as geometric mean concentrations (GMCs) and expressed as µg/mL.
Time Frame
At Month 16 (i.e. one month after booster vaccination)
Title
Antibody Concentrations for Anti-PT, Anti-FHA and Anti-PRN, Post Primary Vaccination
Description
The antibody concentrations for anti-PT, anti-FHA and anti-PRN were presented as GMCs and expressed as IU/mL.
Time Frame
At Month 4 (i.e. one month after 3rd dose of primary vaccination)
Title
Antibody Concentrations for Anti-PT, Anti-FHA and Anti-PRN, Post Booster Vaccination
Description
The antibody concentrations for anti-PT, anti-FHA and anti-PRN were presented as GMCs and expressed as IU/mL.
Time Frame
At Month 16 (i.e. one month after booster vaccination)
Title
Number of Subjects With Any Solicited Local Adverse Events (AEs) Following Each Dose of Primary Vaccination
Description
The solicited local AEs assessed were pain, redness and swelling at injection site. Any = Occurrence of the AE regardless of the intensity grade.
Time Frame
During the 4-day (Days 0-3) follow-up period after each primary vaccination dose (i.e. at Day 0, at Month 1.5 and at Month 3)
Title
Number of Subjects With Any Solicited Local AEs Following Booster Vaccination
Description
The solicited local AEs assessed were pain, redness and swelling at injection site. Any = Occurrence of the AE regardless of the intensity grade.
Time Frame
During the 4-day (Days 0-3) follow-up period after booster vaccination dose (i.e. at Month 15)
Title
Number of Subjects With Any Solicited General AEs Following Each Dose of Primary Vaccination
Description
The solicited general AEs assessed were drowsiness, irritability/fussiness, loss of appetite and fever. Any = Occurrence of the AE regardless of the intensity grade. Any fever = Fever (axillary) ≥ 37.5°C.
Time Frame
During the 4-day (Days 0-3) follow-up period after each primary vaccination dose (i.e. at Day 0, at Month 1.5 and at Month 3)
Title
Number of Subjects With Any Solicited General AEs Following Booster Vaccination
Description
The solicited general AEs assessed were drowsiness, irritability/fussiness, loss of appetite and fever. Any = Occurrence of the AE regardless of the intensity grade. Any fever = Fever (axillary) ≥ 37.5°C.
Time Frame
During the 4-day (Days 0-3) follow-up period after booster vaccination dose (i.e. at Month 15)
Title
Number of Subjects With Unsolicited AEs Following Each Dose of Primary Vaccination
Description
An unsolicited AE was defined as any AE reported in addition to those solicited during the clinical study and any solicited AE with onset outside the specified period of follow-up for solicited AEs. Any = Occurrence of the AE regardless of the intensity grade.
Time Frame
During the 31-day (Days 0-30) follow-up period after each primary vaccination dose (i.e. at Day 0, at Month 1.5 and at Month 3)
Title
Number of Subjects With Unsolicited AEs Following Booster Vaccination
Description
An unsolicited AE was defined as any AE reported in addition to those solicited during the clinical study and any solicited AE with onset outside the specified period of follow-up for solicited AEs. Any = Occurrence of the AE regardless of the intensity grade.
Time Frame
During the 31-day (Days 0-30) follow-up period after booster vaccination dose (i.e. at Month 15)
Title
Number of Subjects With Serious Adverse Events (SAEs)
Description
The SAEs assessed included any untoward medical occurrences that resulted in death, were life threatening, required hospitalisation or prolongation of existing hospitalisation or resulted in disability/incapacity. Any = Occurrence of the AE regardless of the intensity grade.
Time Frame
During the entire study period (i.e. from Day 0 until Month 16)

10. Eligibility

Sex
All
Minimum Age & Unit of Time
3 Months
Maximum Age & Unit of Time
19 Months
Accepts Healthy Volunteers
Accepts Healthy Volunteers
Eligibility Criteria
Inclusion Criteria: Subjects' parent(s)/Legally Acceptable Representatives [LARs] who, in the opinion of the investigator, can and will comply with the requirements of the protocol. A male or female child between 3 and 4 months of age at the time of the first vaccination. Written informed consent obtained from the parents/LARs of the subject prior to performing any study specific procedure. Healthy subjects as established by medical history and clinical examination before entering into the study. Born full-term. Exclusion Criteria: Child in care Use of any investigational or non-registered product other than the study vaccine during the period starting 30 days before the first dose of study vaccine, or planned use during the study period. Any medical condition that in the judgment of the investigator would make intramuscular injection unsafe. Chronic administration of immunosuppressants or other immune-modifying drugs during the period starting since birth. For corticosteroids, this will mean prednisone ≥ 0.5 mg/kg/day, or equivalent. Inhaled and topical steroids are allowed. Administration of long-acting immune-modifying drugs at any time during the study period Planned administration/administration of a vaccine not foreseen by the study protocol in the period starting 30 days before the first dose and ending 30 days after the last dose of vaccine administration, with the exception of hepatitis B and other vaccines given as part of the national immunisation schedule and as part of routine vaccination practice, that are allowed at any time during the study period. Seasonal or pandemic influenza vaccine can be given at any time during the study, and according to the Summary of Product Characteristics and national recommendations. Concurrently participating in another clinical study, at any time during the study period, in which the subject has been or will be exposed to an investigational or a non-investigational vaccine/product Previous vaccination against diphtheria, tetanus, pertussis, poliomyelitis and Hib diseases. History of diphtheria, tetanus, pertussis, poliomyelitis and Hib diseases. Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination. Family history of congenital or hereditary immunodeficiency. History of any reaction or hypersensitivity likely to be exacerbated by any component of the vaccine. Major congenital defects. Serious chronic illness. History of any neurological disorders or seizures. Acute disease and/or fever at the time of enrolment. Fever is defined as temperature ≥37.5°C for oral, axillary or tympanic route, or ≥38.0°C for rectal route. Subjects with a minor illness without fever may be enrolled at the discretion of the investigator. Administration of immunoglobulins and/or any blood products since birth or planned administration during the study period.
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
GSK Clinical Trials
Organizational Affiliation
GlaxoSmithKline
Official's Role
Study Director
Facility Information:
Facility Name
GSK Investigational Site
City
Barnaul
ZIP/Postal Code
656056
Country
Russian Federation
Facility Name
GSK Investigational Site
City
Ekaterinburg
ZIP/Postal Code
620131
Country
Russian Federation
Facility Name
GSK Investigational Site
City
Murmansk
ZIP/Postal Code
183038
Country
Russian Federation
Facility Name
GSK Investigational Site
City
St.Petersburg
ZIP/Postal Code
191025
Country
Russian Federation
Facility Name
GSK Investigational Site
City
Tomsk
ZIP/Postal Code
634 050
Country
Russian Federation

12. IPD Sharing Statement

Plan to Share IPD
Yes
IPD Sharing Plan Description
IPD for this study will be made available via the Clinical Study Data Request site.
IPD Sharing Time Frame
IPD will be made available within 6 months of publishing the results of the primary endpoints of the study.
IPD Sharing Access Criteria
Access is provided after a research proposal is submitted and has received approval from the Independent Review Panel and after a Data Sharing Agreement is in place. Access is provided for an initial period of 12 months but an extension can be granted, when justified, for up to another 12 months.
IPD Sharing URL
http://clinicalstudydatarequest.com
Citations:
PubMed Identifier
32048889
Citation
Romanenko V, Osipova I, Galustyan A, Scherbakov M, Baudson N, Farhi D, Anaya L, Kuriyakose SO, Meyer N, Janssens W. Immunogenicity and safety of a combined DTPa-IPV/Hib vaccine administered as a three-dose primary vaccination course and a booster dose in healthy children in Russia: a phase III, non-randomized, open-label study. Hum Vaccin Immunother. 2020 Sep 1;16(9):2265-2273. doi: 10.1080/21645515.2020.1720437. Epub 2020 Feb 12.
Results Reference
derived

Learn more about this trial

A Study to Assess the Immunogenicity and Safety of GSK Biologicals' Infanrix-IPV/Hib Vaccine Administered as a Three-dose Vaccination Course at 3, 4.5 and 6 Months of Age and a Booster Dose at 18 Months of Age in Healthy Infants in Russia

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