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Persistence of immunogenicity after seven COVID-19 vaccines given as third dose boosters following two doses of ChAdOx1 nCov-19 or BNT162b2 in the UK: three month analyses of the COV-BOOST trial

Persistence of immunogenicity after seven COVID-19 vaccines given as third dose boosters following two doses of ChAdOx1 nCov-19 or BNT162b2 in the UK: three month analyses of the COV-BOOST trial
Persistence of immunogenicity after seven COVID-19 vaccines given as third dose boosters following two doses of ChAdOx1 nCov-19 or BNT162b2 in the UK: three month analyses of the COV-BOOST trial

OBJECTIVES: To evaluate the persistence of immunogenicity three months after third dose boosters.

METHODS: COV-BOOST is a multicentre, randomised, controlled, phase 2 trial of seven COVID-19 vaccines used as a third booster dose. The analysis was conducted using all randomised participants who were SARS-CoV-2 naïve during the study.

RESULTS: Amongst the 2883 participants randomised, there were 2422 SARS-CoV-2 naïve participants until D84 visit included in the analysis with median age of 70 (IQR: 30-94) years. In the participants who had two initial doses of ChAdOx1 nCov-19 (Oxford-AstraZeneca; hereafter referred to as ChAd), schedules using mRNA vaccines as third dose have the highest anti-spike IgG at D84 (e.g. geometric mean concentration of 8674 ELU/ml (95% CI: 7461-10,085) following ChAd/ChAd/BNT162b2 (Pfizer-BioNtech, hearafter referred to as BNT)). However, in people who had two initial doses of BNT there was no significant difference at D84 in people given ChAd versus BNT (geometric mean ratio (GMR) of 0.95 (95%CI: 0.78, 1.15). Also, people given Ad26.COV2.S (Janssen; hereafter referred to as Ad26) as a third dose had significantly higher anti-spike IgG at D84 than BNT (GMR of 1.20, 95%CI: 1.01,1.43). Responses at D84 between people who received BNT (15 μg) or BNT (30 μg) after ChAd/ChAd or BNT/BNT were similar, with anti-spike IgG GMRs of half-BNT (15 μg) versus BNT (30 μg) ranging between 0.74-0.86. The decay rate of cellular responses were similar between all the vaccine schedules and doses.

CONCLUSIONS: 84 days after a third dose of COVID-19 vaccine the decay rates of humoral response were different between vaccines. Adenoviral vector vaccine anti-spike IgG concentrations at D84 following BNT/BNT initial doses were similar to or even higher than for a three dose (BNT/BNT/BNT) schedule. Half dose BNT immune responses were similar to full dose responses. While high antibody tires are desirable in situations of high transmission of new variants of concern, the maintenance of immune responses that confer long-lasting protection against severe disease or death is also of critical importance. Policymakers may also consider adenoviral vector, fractional dose of mRNA, or other non-mRNA vaccines as third doses.

COVID-19 vaccine, Fractional dose, Heterologous boost, Homologous boost, Immunogenicity, Persistence, Third dose
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Liu, Xinxue, Munro, Alasdair P S, Feng, Shuo, Janani, Leila, Aley, Parvinder K, Babbage, Gavin, Cathie, Katrina, Owens, Daniel R, Read, Robert C and Faust, Saul N , COV-BOOST study group (2022) Persistence of immunogenicity after seven COVID-19 vaccines given as third dose boosters following two doses of ChAdOx1 nCov-19 or BNT162b2 in the UK: three month analyses of the COV-BOOST trial. Journal of Infection, 84 (6), 795-813. (doi:10.1016/j.jinf.2022.04.018).

Record type: Article

Abstract

OBJECTIVES: To evaluate the persistence of immunogenicity three months after third dose boosters.

METHODS: COV-BOOST is a multicentre, randomised, controlled, phase 2 trial of seven COVID-19 vaccines used as a third booster dose. The analysis was conducted using all randomised participants who were SARS-CoV-2 naïve during the study.

RESULTS: Amongst the 2883 participants randomised, there were 2422 SARS-CoV-2 naïve participants until D84 visit included in the analysis with median age of 70 (IQR: 30-94) years. In the participants who had two initial doses of ChAdOx1 nCov-19 (Oxford-AstraZeneca; hereafter referred to as ChAd), schedules using mRNA vaccines as third dose have the highest anti-spike IgG at D84 (e.g. geometric mean concentration of 8674 ELU/ml (95% CI: 7461-10,085) following ChAd/ChAd/BNT162b2 (Pfizer-BioNtech, hearafter referred to as BNT)). However, in people who had two initial doses of BNT there was no significant difference at D84 in people given ChAd versus BNT (geometric mean ratio (GMR) of 0.95 (95%CI: 0.78, 1.15). Also, people given Ad26.COV2.S (Janssen; hereafter referred to as Ad26) as a third dose had significantly higher anti-spike IgG at D84 than BNT (GMR of 1.20, 95%CI: 1.01,1.43). Responses at D84 between people who received BNT (15 μg) or BNT (30 μg) after ChAd/ChAd or BNT/BNT were similar, with anti-spike IgG GMRs of half-BNT (15 μg) versus BNT (30 μg) ranging between 0.74-0.86. The decay rate of cellular responses were similar between all the vaccine schedules and doses.

CONCLUSIONS: 84 days after a third dose of COVID-19 vaccine the decay rates of humoral response were different between vaccines. Adenoviral vector vaccine anti-spike IgG concentrations at D84 following BNT/BNT initial doses were similar to or even higher than for a three dose (BNT/BNT/BNT) schedule. Half dose BNT immune responses were similar to full dose responses. While high antibody tires are desirable in situations of high transmission of new variants of concern, the maintenance of immune responses that confer long-lasting protection against severe disease or death is also of critical importance. Policymakers may also consider adenoviral vector, fractional dose of mRNA, or other non-mRNA vaccines as third doses.

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Accepted/In Press date: 5 April 2022
e-pub ahead of print date: 9 April 2022
Published date: June 2022
Additional Information: Funding Information: The study protocol is provided in the appendix. Individual participant data will be made available when the study is complete upon reasonable requests made to the corresponding author; data can be shared through secure online platforms after proposals are approved. All the sequence datasets used in the T-cell analysis are available in the public GISAID database (https://www.gisaid.org). The study is funded by the UK Government through the National Institute for Health Research (NIHR) and the Vaccine Task Force (VTF). The study Sponsor is University Hospital Southampton NHS Foundation Trust, Southampton, UK. ChAd, BNT and m1273 used in this study were supplied by the UK Health Security Agency (previously Public Health England). NVX, VLA, Ad26 and CVn were supplied by the manufacturers, without charge. The research is supported by the NIHR Southampton Clinical Research Facility and Biomedical Research Centre, the NIHR Clinical Research Facilities and NIHR Clinical Research Network and the NIHR funded National Immunisation Schedule Evaluation Consortium (NISEC). SNF and MDS are NIHR Senior Investigators. KC is a Wellcome Trust Investigator (210755/Z/18/Z) and NIHR Senior Investigator Emeritus. GRS and TL received funding from the Chinese Academy of Medical Science (CAMS) Oxford Institute (COI). The views expressed are those of the authors and not necessarily those of the NIHR or the Department of Health and Social Care. The investigators would like to thank the UK Medicines and Healthcare products Regulatory Agency (MHRA) and Heath Research Authority (HRA) for their extraordinary efforts in rapidly reviewing submissions, for their attention to detail and input into trial design. Specific thanks go to Drs Kirsty Wydenbach, Lisa Campbell, David Jones, Graham McNaughton, Marie-Christine Bielsky and David Brown at the MHRA; to Drs David Carpenter (Chair) and Mike Proven (Vice-Chair) and all volunteer officers/members of the South Central, Berkshire Research Ethics Committee; and to Kevin Ahmed and all HRA staff who supported the trial. The investigators express their gratitude for the contribution of all trial participants, the UK Vaccine Task Force (Jacinda Kemps) and the invaluable advice of the trial committees. Professors Andrew Ustianowski (Chair) and Chris Rogers, and Dr Andrew Riordan serve as the independent members of the Data Monitoring and Safety Committee and Professor Robert Read is the Chair of the Trial Steering Committee. Funding Information: The study is funded by the UK Government through the National Institute for Health Research (NIHR) and the Vaccine Task Force (VTF). The study Sponsor is University Hospital Southampton NHS Foundation Trust, Southampton, UK. ChAd, BNT and m1273 used in this study were supplied by the UK Health Security Agency (previously Public Health England). NVX, VLA, Ad26 and CVn were supplied by the manufacturers, without charge. The research is supported by the NIHR Southampton Clinical Research Facility and Biomedical Research Centre, the NIHR Clinical Research Facilities and NIHR Clinical Research Network and the NIHR funded National Immunisation Schedule Evaluation Consortium (NISEC). SNF and MDS are NIHR Senior Investigators. KC is a Wellcome Trust Investigator (210755/Z/18/Z) and NIHR Senior Investigator Emeritus. GRS and TL received funding from the Chinese Academy of Medical Science (CAMS) Oxford Institute (COI). The views expressed are those of the authors and not necessarily those of the NIHR or the Department of Health and Social Care. The investigators would like to thank the UK Medicines and Healthcare products Regulatory Agency (MHRA) and Heath Research Authority (HRA) for their extraordinary efforts in rapidly reviewing submissions, for their attention to detail and input into trial design. Specific thanks go to Drs Kirsty Wydenbach, Lisa Campbell, David Jones, Graham McNaughton, Marie-Christine Bielsky and David Brown at the MHRA; to Drs David Carpenter (Chair) and Mike Proven (Vice-Chair) and all volunteer officers/members of the South Central, Berkshire Research Ethics Committee; and to Kevin Ahmed and all HRA staff who supported the trial. The investigators express their gratitude for the contribution of all trial participants, the UK Vaccine Task Force (Jacinda Kemps) and the invaluable advice of the trial committees. Professors Andrew Ustianowski (Chair) and Chris Rogers, and Dr Andrew Riordan serve as the independent members of the Data Monitoring and Safety Committee and Professor Robert Read is the Chair of the Trial Steering Committee. Funding Information: KC acts on behalf of University Hospital Southampton as an investigator on studies funded or sponsored by vaccine manufacturers including AstraZeneca, GlaxoSmithKline, Janssen, Medimmune, Merck, Pfizer, Sanofi and Valneva. She receives no personal financial payment for this work. SNF acts on behalf of University Hospital Southampton NHS Foundation Trust as an Investigator and/or providing consultative advice on clinical trials and studies of COVID-19 and other vaccines funded or sponsored by vaccine manufacturers including Janssen, Pfizer, AstraZeneca, GlaxoSmithKline, Novavax, Seqirus, Sanofi, Medimmune, Merck and Valneva vaccines and antimicrobials. He receives no personal financial payment for this work. ALG is named as an inventor on a patent covering use of a particular promoter construct that is often used in ChAdOx1-vectored vaccines and is incorporated in the ChAdOx1 nCoV-19 vaccine. ALG may benefit from royalty income paid to the University of Oxford from sales of this vaccine by AstraZeneca and its sublicensees under the University's revenue sharing policy. JH has received payments for presentations for AstraZeneca, Boehringer Ingelheim, Chiesi, Ciple & Teva. VL acts on behalf of University College London Hospitals NHS Foundation Trust as an Investigator on clinical trials of COVID-19 vaccines funded or sponsored by vaccine manufacturers including Pfizer, AstraZeneca and Valneva. He receives no personal financial payment for this work. PM acts on behalf of University Hospital Southampton NHS Foundation Trust and The Adam Practice as an investigator on studies funded or sponsored by vaccine manufacturers including AstraZeneca, GlaxoSmithKline, Novavax, Medicago and Sanofi. He received no personal financial payment for this work. JSN-V-T is seconded to the Department of Health and Social Care, England until 31st March 2022. MR has provided post marketing surveillance reports on vaccines for Pfizer and GSK for which a cost recover charge is made. MDS acts on behalf of the University of Oxford as an investigator on studies funded or sponsored by vaccine manufacturers including AstraZeneca, GlaxoSmithKline, Pfizer, Novavax. Janssen, Medimmune and MCM vaccines. He received no personal financial payment for this work. Publisher Copyright: © 2022
Keywords: COVID-19 vaccine, Fractional dose, Heterologous boost, Homologous boost, Immunogenicity, Persistence, Third dose

Identifiers

Local EPrints ID: 457010
URI: http://eprints.soton.ac.uk/id/eprint/457010
ISSN: 0163-4453
PURE UUID: 1d4f1da6-f3d0-4c36-848e-ba7940d4ba4c
ORCID for Robert C Read: ORCID iD orcid.org/0000-0002-4297-6728
ORCID for Saul N Faust: ORCID iD orcid.org/0000-0003-3410-7642

Catalogue record

Date deposited: 19 May 2022 16:44
Last modified: 17 Mar 2024 03:28

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Contributors

Author: Xinxue Liu
Author: Alasdair P S Munro
Author: Shuo Feng
Author: Leila Janani
Author: Parvinder K Aley
Author: Gavin Babbage
Author: David Baxter
Author: Marcin Bula
Author: Katrina Cathie
Author: Krishna Chatterjee
Author: Wanwisa Dejnirattisai
Author: Kate Dodd
Author: Yvanne Enever
Author: Ehsaan Qureshi
Author: Anna L Goodman
Author: Christopher A Green
Author: Linda Harndahl
Author: John Haughney
Author: Alexander Hicks
Author: Agatha A van der Klaauw
Author: Jonathan Kwok
Author: Vincenzo Libri
Author: Martin J Llewelyn
Author: Alastair C McGregor
Author: Angela M Minassian
Author: Patrick Moore
Author: Mehmood Mughal
Author: Yama F Mujadidi
Author: Kyra Holliday
Author: Orod Osanlou
Author: Rostam Osanlou
Author: Daniel R Owens
Author: Mihaela Pacurar
Author: Adrian Palfreeman
Author: Daniel Pan
Author: Tommy Rampling
Author: Karen Regan
Author: Stephen Saich
Author: Teona Serafimova
Author: Dinesh Saralaya
Author: Gavin R Screaton
Author: Sunil Sharma
Author: Ray Sheridan
Author: Ann Sturdy
Author: Piyada Supasa
Author: Emma C Thomson
Author: Shirley Todd
Author: Chris Twelves
Author: Robert C Read ORCID iD
Author: Saul N Faust ORCID iD
Corporate Author: COV-BOOST study group

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