COVID-19 Fourth Dose Study in Australia

Murdoch Childrens Research Institute

Status and phase: Withdrawn; Phase 3

Conditions: COVID-19

Treatments: Biological: Elasomeran; Biological: Bivalent Moderna; Biological: Bivalent Pfizer-BioNTech; Biological: Tozinameran

Study type: Interventional

Funder types: Other

Identifiers

NCT05543356

88825

Details and patient eligibility

About

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.

Full 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).

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

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.

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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0 participants in 8 patient groups

Monovalent Pfizer-BioNTech(BNT162b2): Pfizer-BioNTech(BNT162b2)-Pfizer-BioNTech(BNT162b2)

Active Comparator group

Description:

Participants who received Pfizer-BioNTech(BNT162b2) as primary series and Pfizer-BioNTech(BNT162b2) as first booster will receive a second booster dose of: Biological/Vaccine: Tozinameran - Monovalent Tozinamrean is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cell-free in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).

Treatment:

Biological: Tozinameran

Biological: Tozinameran

Monovalent Moderna(mRNA-1273, Spikevax®): Pfizer-BioNTech(BNT162b2)-Pfizer-BioNTech(BNT162b2)

Active Comparator group

Description:

Participants who received Pfizer-BioNTech(BNT162b2) as primary series and Pfizer-BioNTech(BNT162b2) as first booster will receive a second booster dose of: Biological/Vaccine: Elasomeran - Monovalent Elasomeran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cell-free in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of SARS-CoV-2).

Treatment:

Biological: Elasomeran

Biological: Elasomeran

Monovalent Pfizer-BioNTech(BNT162b2): AstraZeneca(ChAdOx1, Vaxzevria®)-Pfizer-BioNTech(BNT162b2)

Active Comparator group

Description:

Participants who received AstraZeneca (ChAdOx1, or Vaxzevria®) as primary series and Pfizer-BioNTech (BNT162b2) as first booster will received a second booster dose of: Biological/Vaccine: Tozinameran - Monovalent Tozinamrean is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cell-free in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).

Treatment:

Biological: Tozinameran

Biological: Tozinameran

Monovalent Moderna(mRNA-1273, Spikevax®):AstraZeneca(ChAdOx1, Vaxzevria®)-Pfizer-BioNTech(BNT162b2)

Active Comparator group

Description:

Participants who received AstraZeneca (ChAdOx1, or Vaxzevria®) as primary series and Pfizer-BioNTech (BNT162b2) as first booster will received a second booster dose of: Biological/Vaccine: Elasomeran - Monovalent Elasomeran is a single-stranded, 5'-capped messenger RNA (mRNA) produced using a cell-free in vitro transcription from the corresponding DNA templates, encoding the viral spike (S) protein of SARS-CoV-2).

Treatment:

Biological: Elasomeran

Biological: Elasomeran

Bivalent Pfizer-BioNTech (BNT162b2 OMI): Pfizer-BioNTech(BNT162b2)-Pfizer-BioNTech(BNT162b2)

Active Comparator group

Description:

Participants who received Pfizer-BioNTech(BNT162b2) as primary series and Pfizer-BioNTech(BNT162b2) as first booster will receive a second booster dose of: Biological/Vaccine: Pfizer-BioNTech, BNT162b2 OMI - bivalent Pfizer-BioNTech bivalent COVID-19 vaccine contains ancestral BNT162b2 and Omicron variant BNT162b2 Omi (BA.1). The Pfizer-BioNTech COVID-19 vaccine, BNT162b2, encodes a P2 mutant spike protein and is formulated as an RNA-lipid nanoparticle (LNP) of nucleoside-modified mRNA (modRNA).

Treatment:

Biological: Bivalent Pfizer-BioNTech

Biological: Bivalent Pfizer-BioNTech

Bivalent Moderna (mRNA-1273.214): Pfizer-BioNTech(BNT162b2)-Pfizer-BioNTech(BNT162b2)

Active Comparator group

Description:

Participants who received Pfizer-BioNTech(BNT162b2) as primary series and Pfizer-BioNTech(BNT162b2) as first booster will receive a second booster dose of: Biological/Vaccine: Moderna, mRNA-1273.214 - bivalent The Moderna bivalent vaccine (mRNA-1273.214) encodes the prefusion stabilized S protein of SARS-CoV-2 formulated in RNA-lipid nanoparticles composed of 4 lipids and 1-monomethoxypolyethyleneglycol-2, 3-dimyristylglycerol with polyethylene glycol. 25μg of each mRNA sequence that encode the prefusion stabilized spike glycoproteins of the ancestral SARS-CoV-2 (Wuhan-Hu-1) and the Omicron variant (B.1.1.529 \[BA.1\]).

Treatment:

Biological: Bivalent Moderna

Biological: Bivalent Moderna

Bivalent Pfizer-BioNTech (BNT162b2): AstraZeneca(ChAdOx1, Vaxzevria®)-Pfizer-BioNTech(BNT162b2)

Active Comparator group

Description:

Participants who received AstraZeneca (ChAdOx1-S, or Vaxzevria®) as primary series and Pfizer-BioNTech (BNT162b2) as first booster will received a second booster dose of: Biological/Vaccine: Pfizer-BioNTech, BNT162b2 OMI - bivalent Pfizer-BioNTech bivalent COVID-19 vaccine contains ancestral BNT162b2 and Omicron variant BNT162b2 Omi (BA.1). The Pfizer-BioNTech COVID-19 vaccine, BNT162b2, encodes a P2 mutant spike protein and is formulated as an RNA-lipid nanoparticle of nucleoside-modified mRNA.

Treatment:

Biological: Bivalent Pfizer-BioNTech

Biological: Bivalent Pfizer-BioNTech

Bivalent Moderna (mRNA-1273.214): AstraZeneca(ChAdOx1, Vaxzevria®)-Pfizer-BioNTech(BNT162b2)

Active Comparator group

Description:

Participants who received AstraZeneca (ChAdOx1-S, or Vaxzevria®) as primary series and Pfizer-BioNTech (BNT162b2) as first booster will received a second booster dose of: Biological/Vaccine: Moderna, mRNA-1273.214 - bivalent The Moderna bivalent vaccine (mRNA-1273.214) encodes the prefusion stabilized S protein of SARS-CoV-2 formulated in RNA-lipid nanoparticles composed of 4 lipids and 1-monomethoxypolyethyleneglycol-2, 3-dimyristylglycerol with polyethylene glycol. 25μg of each mRNA sequence that encode the prefusion stabilized spike glycoproteins of the ancestral SARS-CoV-2 (Wuhan-Hu-1) and the Omicron variant (B.1.1.529 \[BA.1\]).

Treatment:

Biological: Bivalent Moderna

Biological: Bivalent Moderna