NCT06740630 - A Study on the Immune Response and Safety of an Investigational Chickenpox Vaccine When Given to Healthy Children 12 to 15 Months of Age | Crick

Eligibility

Sex: ALLMin age: 12 MonthsMax age: 15 MonthsHealthy volunteers:

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Inclusion Criteria: * Participant's parent(s) Legally acceptable representatives /(LAR\[s\]), who, in the opinion of the investigator, can and will comply with the requirements of the protocol (e.g., completion of the eDiaries, return for follow-up visits). * Written or witnessed/thumb printed informed consent obtained from the participant's parent(s)/LAR(s) prior to performance of any study-specific procedure. * Healthy participants as established by medical history and clinical examination before entering into the study. * A male or female between, and including, 12 to 15 months of age (i.e., from the day of 1-year birthday until the day before 16 months of age) at the time of the administration of study interventions. * Only for children in countries where PCV is recommended at 12 to 15 months of age as per national immunization schedule and provided as part of the study interventions: * Participant who previously received the primary series of PCV in the first year of life with last dose at least 60 days prior to study entry. Exclusion Criteria: * History of any reaction or hypersensitivity likely to be exacerbated by any component of the study interventions. * Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination. * Hypersensitivity to latex. * Major congenital defects, as assessed by the investigator. * Recurrent history of uncontrolled neurological disorders or seizures. * History of varicella disease. * Active untreated tuberculosis. * Any other clinical condition that, in the opinion of the investigator, might pose additional risk to the participant due to participation in the study. * Use of any investigational or non-registered product (drug, vaccine or invasive medical device) other than the study interventions during the period beginning 30 days before the dose of study interventions administration (Day -29 to Day 1), or their planned use during the study period. * Planned administration of a vaccine in the period starting 30 days before the dose and ending 43 days after the dose of study interventions administration\* (Visit 2) with the exception of inactivated influenza vaccine which may be given at any time during the study and administered at a different location than the study interventions. Any other age-appropriate vaccine may be given starting at Visit 2 and anytime thereafter. \*If emergency mass vaccination for an unforeseen public health threat (e.g., a pandemic) is organized by public health authorities outside the routine immunization program, the time period described above can be reduced provided it is used according to the local governmental recommendations and sponsor is notified * Chronic administration of immune-modifying drugs (defined as more than 14 consecutive days in total) and/or planned use of long-acting immune modifying treatments at any time up to the end of the study. * Up to 90 days prior to the study intervention administration: * For corticosteroids, this will mean prednisone equivalent \>=0.5 mg/kg/day with maximum of 20 mg/day for pediatric participants. Inhaled and topical steroids are allowed. * Administration of immunoglobulins and/or any blood products or plasma derivatives. * Up to 180 days prior to study interventions administration: long acting immune-modifying drugs including among others immunotherapy (e.g., tumor necrosis factor-inhibitors), monoclonal antibodies (except the ones not interfering with the immune response to the study vaccines, e.g., nirsevimab), antitumoral medication. * Previous vaccination against measles, mumps, and rubella. * Previous vaccination against hepatitis A virus. * Previous vaccination against varicella virus. * Only for children in countries where PCV is recommended at 12 to 15 months of age as per national immunization schedule and provided as part of the study interventions, participant who previously received a booster dose of any PCV. * Concurrently participating in another clinical study, at any time during the study period, in which the participant has been or will be exposed to an investigational or a non-investigational intervention (drug/invasive medical device). * Child in care. * Any study personnel's immediate dependents, family, or household members. * Participants with the following high-risk individuals in their household: * Immunocompromised individuals. * Pregnant women without documented history of varicella. * Newborn infants of mothers without documented history of varicella. * Newborn infants born less than (\<) 28 weeks of gestation.

Outcomes

Primary Outcomes

Percentage of participants with seroresponse to Varicella Zoster Virus (VZV) anti-glycoprotein E (gE) Immunoglobulin (IgG) for the 3 lots of VNS vaccine groups

Seroresponse is defined as post-vaccination (Day 43) anti-VZV gE IgG antibody concentration greater than or equal to (\>=) 300 milli-international units per milliliter (mIU/mL) among participants who were seronegative \[(antibody concentration less than (\<) LLOQ (Lower limit of quantification)\] before vaccination. A seronegative participant is a participant whose antibody concentration is below the LLOQ of the assay. A seropositive participant is a participant whose antibody concentration is greater than or equal to the LLOQ of the assay.

Time frame: At Day 43

Geometric Mean Concentration (GMC) of anti-VZV gE IgG for the 3 lots of VNS vaccine groups

Concentrations of anti-VZV gE IgG presented as GMCs and expressed in mIU/mL for each group.

Time frame: At Day 43

Percentage of participants with seroresponse to anti-VZV gE IgG for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups

Seroresponse is defined as post-vaccination (Day 43) anti-VZV gE IgG concentration \>= 300 mIU/mL among participants who were seronegative (antibody concentration \< LLOQ) before vaccination. A seronegative participant is a participant whose antibody concentration is below the LLOQ of the assay. A seropositive participant is a participant whose antibody concentration is greater than or equal to the LLOQ of the assay.

Time frame: At Day 43

GMCs of anti-VZV gE IgG for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups

Concentrations of anti-VZV gE IgG are presented as GMCs and expressed in mIU/mL for each group.

Time frame: At Day 43

Secondary Outcomes

Anti-measles antibodies GMCs for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups

Time frame: At Day 43

Anti-mumps antibodies GMCs for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups

Time frame: At Day 43

Anti-rubella antibodies GMCs for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups

Time frame: At Day 43

Percentage of participants with seroresponse to anti-measles for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups

Seroresponse is defined as post-vaccination (Day 43) anti-measles antibody concentration \>= cut-off value among participants who were seronegative (antibody concentration \< cut-off value) before vaccination. The assay cut-off values for anti-measles will be defined by the laboratory before the analysis.

Time frame: At Day 43

Percentage of participants with seroresponse to anti-mumps for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups

Seroresponse is defined as post-vaccination (Day 43) anti-mumps antibody concentration \>= cut-off value among participants who were seronegative (antibody concentration \< cut-off value) before vaccination. The assay cut-off values for anti-mumps will be defined by the laboratory before the analysis.

Time frame: At Day 43

Percentage of participants with seroresponse to anti-rubella for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups

Seroresponse is defined as post-vaccination (Day 43) anti-rubella antibody concentration \>= cut-off value among participants who were seronegative (antibody concentration \< cut-off value) before vaccination. The assay cut-off values for anti-rubella will be defined by the laboratory before the analysis.

Time frame: At Day 43

Anti-Hepatitis A antibodies GMCs for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups in Hepatitis A virus (HAV) subset

Time frame: At Day 43

Percentage of participants with seroresponse to anti-HAV for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups in HAV subset

Seroresponse is defined as post-vaccination (Day 43) anti-HAV antibody concentration \>= cut-off value among participants who were seronegative (antibody concentration \< cut-off value) before vaccination. The assay cut-off values for anti-HAV antibodies will be defined by the laboratory before the analysis.

Time frame: At Day 43

Anti-S. pneumoniae serotype specific Polysaccharide IgG antibody concentrations for the 3 pooled lots of VNS vaccine groups compared with the 2 pooled lots of VV groups in PCV subset

S. pneumoniae polysaccharides to be tested: 1, 3, 4, 5, 6A, 6B, 7F, 8, 9V, 10A, 11A, 12F, 14, 15B, 18C, 19A, 19F, 22F, 23F, and 33F.

Time frame: At Day 43

Percentage of participants in the VNS vaccine pooled group with anti-VZV gE antibody concentrations above the adaptive seroresponse threshold

The adaptive seroresponse threshold is the anti-VZV gE IgG antibody concentration for which the response rate in the VV group is 95% or higher.

Time frame: At Day 43

Percentage of participants reporting each solicited administration site event

Solicited administration site events include injection site redness, pain and swelling.

Time frame: Day 1 (post-dose) to Day 4

Percentage of participants reporting each solicited systemic event

Solicited systemic events include drowsiness, loss of appetite and irritability.

Time frame: Day 1 (post-dose) to Day 15

Percentage of participants reporting each solicited systemic event in terms of fever

Fever is defined as temperature greater than or equal to (\>=)38.0 degrees Celsius (°C) by any route (the preferred location for measuring temperature is the axilla).

Time frame: Day 1 (post-dose) to Day 22

Percentage of participants reporting each solicited administration site event

Solicited administration site events include injection site varicella-like rash.

Time frame: Day 1 (post-dose) to Day 43

Percentage of participants reporting each solicited systemic event

Solicited systemic events include varicella-like rash (non-injection site) and general rash (not varicella-like).

Time frame: Day 1 (post-dose) to Day 43

Percentage of participants reporting unsolicited adverse events (AEs)

Unsolicited AEs include any AE reported in addition to solicited events during the study, or any "solicited" symptoms with onset outside of the specified period of follow-up for solicited symptoms, are assessed for each group after the administration of all vaccines.

Time frame: Day 1 (post-dose) to Day 43

Percentage of participants reporting medically attended AEs (MAAE)

A MAAE is an AE for which the participant received medical attention including any symptom or illness requiring hospitalization, or an emergency room visit, or visit to/by a healthcare professional.

Time frame: Day 1 (post-dose) to Day 181 (study end)

Percentage of participants reporting serious adverse events (SAEs)

A SAE is an AE which results in death, is life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in disability/incapacity, or other situations that are considered serious per medical or scientific judgment.

Time frame: Day 1 (post-dose) to Day 181 (study end)

A Study on the Immune Response and Safety of an Investigational Chickenpox Vaccine When Given to Healthy Children 12 to 15 Months of Age

Overview

Conditions

Interventions

Eligibility

Locations (97)

Outcomes

Primary Outcomes

Secondary Outcomes

Central Contacts