To Compare the Reactogenicity and Immunogenicity of Recommended COVID-19 Vaccines in Young Adolescents and Children in Hong Kong
Trial Snapshot
- Phase
- Phase 2
- Status
- Active, not recruiting
- Sponsor
- The University of Hong Kong
- Enrollment
- 1,018
- Locations
- 1
- Primary Endpoint
- Neutralizing antibody response
Study Overview
Brief Summary
Objectives To assess the reactogenicity, measure the adaptive immune responses and track the long-term immune memory in healthy children and adults as well as pediatric patients receiving the COVID-19 vaccines-BNT162b2, CoronaVac-chosen by the Hong Kong Government; to compare the reactogenicity and immunogenicity across the vaccines used for these children and adults.
Hypothesis to be tested The safety profile and the magnitude and durability of immune responses to the COVID-19 vaccines in children are non-inferior to those in adults.
Design and subjects A single-site, comparative nonrandomised clinical trial for 450 healthy individuals or patients under 18 years old and one or both healthy parents and unrelated adults to receive one of COVID-19 vaccines by intramuscular injection (and intradermal injection)
Instruments Mobile app for subjects to record adverse effects, enzyme-linked immunosorbent assay, plaque reduction neutralization assay, luciferase immunoprecipitation system assay and flow cytometry.
Interventions BNT162b2 and CoronaVac, by intramuscular or intradermal route
Main outcome measures Types and frequencies of adverse effects within 7 days, and changes and peaks of antibody levels and antigen-specific memory T cell responses for 3 years.
Study Design
- Study Type
- Interventional
- Allocation
- Non Randomized
- Intervention Model
- Parallel
- Primary Purpose
- Prevention
- Masking
- None
Eligibility Criteria
- Ages
- 0 Years to 100 Years (Child, Adult, Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •informed consent from the parents or a legally acceptable representative for an underage participant
- •biological parents of students enrolled in the trial or unrelated healthy adults
- •ability to adhere to the follow-up schedules
- •willingness to report reactogenicity daily for 7 days post dose 1, 2 and 3 (and 4) proactively
- •willingness to receive that vaccine available for that particular recruitment period (as student-parent pair, if applicable)
- •good past health, including pre-existing clinically stable disease, such as paediatric or immune disorders
- •prior COVID-19 (for COVID-19 survivor subgroup)
Exclusion Criteria
- •reported pregnancy or breastfeeding
Outcomes
Primary Outcomes
Neutralizing antibody response
Time Frame: 1 month post-dose 1, and 1, 6, 18, and 36 months post-dose 3 (and 2 weeks after dose 4)
Geometric mean levels and geometric mean fold rise of SARS-CoV2 neutralizing antibodies as determined by plaque reduction neutralization assay and surrogate assays
T cell response
Time Frame: 1 month post-dose 1, and 1, 6, 18, and 36 months post-dose 3 (and 2 weeks after dose 4)
Geometric mean percentage of CD4 and CD8 T cells specific to SARS-CoV2 S (and N and M) protein
Adverse reactions
Time Frame: 7 days post-doses 1, 2 and 3 (and 4)
Percentage of occurrence, types, duration and severity of adverse reactions occurring within 7 days
Binding antibody response
Time Frame: 1 month post-dose 1, and 1, 6, 18, and 36 months post-dose 3 (and 2 weeks after dose 4)
Geometric mean levels of SARS-CoV2 S and S-RBD-specific binding antibody and related markers as determined by Enzyme-linked Immunosorbent Assay
Secondary Outcomes
- Vaccine breakthrough(Throughout the study period, until 36 months post-dose 3/4)
- Binding anti-N antibody response(1 month post-dose 1, and 1, 6, 18, and 36 months post-dose 3 (and 2 weeks after dose 4))
- Adverse events(Throughout the study period, until 36 months post-dose 3/4)