COVID-19
Conditions
Keywords
Booster dose Moderna and Pfizer, mRNA vaccine, monovalent, bivalent
Brief summary
This clinical trial will be a blinded, randomised study to determine the safety, reactogenicity, and immunogenicity of a second booster dose of SARS-CoV-2 vaccines in adults enrolled over two consecutive stages. Stage 1 will commence at the time of study approval and transition to stage 2 once bivalent vaccines are approved and available in Australia.
Detailed description
Participants will be adults aged 18 years or older who have been previously primed with two doses of either Pfizer-BioNTech (BNT162b2, or Comirnaty®) or AstraZeneca (ChAdOx1-S, or Vaxzevria®) and boosted at least 3 months earlier with Pfizer BioNTech vaccine (30µg). There will be no upper age limit. Participants will be recruited from the Murdoch Children's Research Institute, the Royal Children's Hospital (RCH), the Peter Doherty Research Institute, and, if necessary, the greater Melbourne area. Ideally, 100 participants will be recruited per group unless bivalent Omicron-specific vaccines are introduced before this target is reached for monovalent ancestral vaccines. There will be 800 participants in total. Procedures will be implemented to ensure participants of all ages (aged 18 and above) are included and that there is an even age distribution in each group (\<50 and ≥50 years).
Interventions
BIOLOGICALTozinameran
A single standard dose (30mcg) will be administered on day 0 of the study.
BIOLOGICALElasomeran
A single standard dose (50mcg) of the intervention will be administered on day 0 of the study.
BIOLOGICALBivalent Pfizer-BioNTech
A single standard dose (BNT162b2 15μg +BNT162b2 OMI 15μg) will be administered on day 0 of the study.
BIOLOGICALBivalent Moderna
A single standard dose (BNT162b2 15μg + BNT162b2 OMI 15μg)will be administered on day 0 of the study.
Sponsors
Coalition for Epidemic Preparedness Innovations
The Peter Doherty Institute for Infection and Immunity
Murdoch Childrens Research Institute
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
DOUBLE (Subject, Investigator)
Masking description
The participants and those evaluating reactogenicity will be blinded to the vaccine allocation for the first 7 days following vaccination. After that, both clinical investigators and participants will be aware of their investigational product. Laboratory staff will remain blinded to the investigational product.
Intervention model description
Study participants who have received two doses of either Pfizer or Astrazena vaccine as their primary vaccine and a standard dose of Pfizer for their booster will be randomised into one of four groups. The four groups consist of a standard dose of either the monovalent or bivalent Pfizer or Moderna vaccine.
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
1. Have completed a primary schedule of two doses of Pfizer-BioNTech or AstraZeneca vaccines and received a booster of Pfizer-BioNTech vaccine (30µg) at least 3 months earlier. 2. No confirmed SARS-CoV-2 infection on PCR or RAT within the last 3 months. 3. Willing and able to give written informed consent. 4. Aged 18 years or above. 5. Willing to complete the follow-up requirements of the study.
Exclusion criteria
1. Currently receiving immunosuppressive medication or anti-cancer chemotherapy. 2. Known HIV infection. 3. Congenital immune deficiency syndrome. 4. Received immunoglobulin or other blood products in the three months prior to potential study booster vaccination. 5. Study staff and their relatives. 6. Have a history of a severe allergic reaction to any COVID-19 vaccines or have a medical exemption to receiving further COVID-19 vaccines. 7. Cannot read or understand English.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| SARS-CoV-2 specific Immunoglobulin (Ig)G antibodies at 28-days post booster vaccination | 28-days post booster vaccination | Serum samples collected at 28-days post booster vaccination from all groups will be evaluated for SARS-CoV-2 specific IgG antibodies using the commercial Euroimmun S1 IgG ELISA. Data will be reported as binding antibody units/mL and presented as geometric mean concentration and 95% confidence intervals |
| Total incidence of solicited reactions (systemic and local) | Total incidence of solicited reactions will be measured for 7 days post booster vaccination | Questionnaire to document solicited reactions is developed specifically for this study. Data will be reported as the proportion of participants who report by each intervention arm. Solicited reactions such as pain, tenderness, erythema/redness, induration/swelling, fever, nausea/vomiting, headache, fatigue/malaise, myalgia, arthralgia will be collected from the participants 7 days post-vaccination. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| SARS-CoV-2 specific neutralising antibodies at baseline (pre booster), 28 days and 6- months post booster vaccination measured by SARS-CoV-2 microneutralisation assay | Baseline (pre booster), 28 days-, and 6-months post booster vaccination | A subset of samples from all timepoints will be assessed using a SARS-CoV-2 microneutralisation assay to both the wild type (vaccine) strain and for two SARS-CoV-2 Variants of concern. Neutralizing antibody will be reported as endpoint titre. |
| Interferon gamma (IFNγ) concentrations in International Units (IU)/mL | Baseline (pre booster), 28 days-, and 6-months post booster vaccination | Interferon gamma (IFNγ) concentrations as a measurement of cellular immunity will be assessed on a subset (40%) of the participants from each group. QuantiFERON Human IFN-γ SARS-CoV-2 (Qiagen) will be used to stimulate IFN-γ production in peripheral blood mononuclear cells (PBMCs) and then IFN-γ production will be measured using ELISA. Data will be presented as geometric mean concentration (GMC) and 95% confidence intervals (CI). |
| Number of IFNγ producing cells/million PBMCs | Baseline (pre booster), 28 days-, and 6-months post booster vaccination | IFNγ producing cells as a measurement of cellular immunity will be assessed on a subset (40%) of the participants from each group. IFN-γ Enzyme-Linked ImmunoSpot (Elispot) assay will be performed on isolated peripheral blood mononuclear cells (PBMCs). Data will be reported as number of IFNγ producing cells/million and presented using means and 95% confidence intervals. |
| Frequency of cytokine-expressing T cells | Baseline (pre booster), 28 days-, and 6-months post booster vaccination | Frequency of cytokine-expressing T cells will be assessed on a subset (40%) of participants using Flow cytometry (intracellular staining) on PBMCs samples. Data will be reported as frequency (%) of cytokine-expressing T cells presented as means and 95% CI. |
| SARS-CoV-2 specific IgG antibodies at baseline (pre booster), and 6-months post booster vaccination | Baseline (pre booster), and 6-months post booster vaccination | Serum samples collected at baseline (pre booster), and 6-months post booster vaccination from all groups will be evaluated for SARS-CoV-2 specific IgG antibodies using the commercial Euroimmun S1 IgG ELISA . Data will be reported as binding antibody units/mL and presented as geometric mean concentration and 95% confidence intervals |
| Incidence of unsolicited adverse events (AE) | 28 days-post booster vaccination | All unsolicited AE will be collected for 28 days post booster vaccination. Data will be presented as proportion of participants who report unsolicited AE. |
| Incidence of medically attended adverse events (AE) | 3 months post booster vaccination | Participants with medically attended AE will be collected for 3 months post booster vaccination. Data will be presented as proportion of participants who report unsolicited AE. |
| Incidence of serious adverse events (SAE) | 6 months post booster vaccination | SAE will be collected throughout the follow-up period of 6 months post booster vaccination. Data will be presented as a proportion of participants who report unsolicited SAE. |
| Cytokine concentrations following PBMCs stimulation | Baseline (pre booster), 28 days and 6-months post booster vaccination | Cytokine concentrations following PBMCs stimulation will be assessed on a subset (40%) of participants using multiplex cytokine assays.Data will be reported as cytokine concentrations in pg/ml and presented as GMC and 95% CI. |
| SARS-CoV-2 specific neutralising antibodies at baseline (pre booster), 28 days and 6-months post booster vaccination measured by surrogate virus neutralization test (sVNT) | Baseline (pre booster), 28 days and 6 months post booster vaccination | Serum samples collected at baseline (pre booster), 28 days- and 6-months post booster vaccination from all groups will be evaluated for SARS-CoV-2 specific neutralising antibodies using the GenScript® cPass surrogate virus neutralization test (sVNT) for both wild-type and Omicron variant. Neutralising antibody response will be reported as percentage (%) inhibition of receptor binding domain-angiotensin-converting enzyme 2 (RBD-ACE2) binding relative to a positive control. |
Countries
Australia
Outcome results
None listed