COVID-19 vaccines require two doses at specific intervals to induce adequate immunity
Clinical trials and subsequent evaluations consistently demonstrate that standard COVID-19 vaccines require a primary two-dose regimen, administered at specified intervals, to achieve adequate humoral immunity and optimal clinical efficacy.
The retrieved literature consistently evaluates primary vaccination schedules consisting of two doses and confirms that the second dose is necessary for robust antibody responses and protective efficacy. While some studies examine modified intervals or additional booster doses for specific populations, the core requirement for a multi-dose primary series to induce adequate immunity is well supported by multiple clinical trials and cohort studies (e.g., [0], [1], [3]).
Merryn Voysey, Sue Ann Costa Clemens, Shabir A. Madhi, Lily Yin Weckx, Pedro M. Folegatti, Parvinder K. Aley, Brian Angus, Vicky L. Baillie, Shaun Barnabas, Qasim Bhorat, Sagida Bibi, Carmen Briner, Paola Cicconi, Andrea M. Collins, Rachel Colin-Jones, Clare Cutland, Thomas C. Darton, Keertan Dheda, C.J. Duncan, Katherine R. W. Emary, Katie Ewer, Lee Fairlie, Saul N. Faust, Shuo Feng, Daniela M. Ferreira, Adam Finn, Anna L. Goodman, Catherine Green, Christopher Green, Paul T. Heath, Catherine Hill, Helen Hill, Ian Hirsch, Susanne H. Hodgson, Alane Izu, Susan Jackson, Daniel Jenkin, Carina C. D. Joe, Simon Kerridge, Anthonet Koen, Gaurav Kwatra, Rajeka Lazarus, Alison M. Lawrie, Alice Lelliott, Vincenzo Libri, Patrick Lillie, Raburn M. Mallory, Ana Verena Almeida Mendes, Eveline Pı́polo Milan, Angela M. Minassian, Alastair McGregor, Hazel Morrison, Yama F Mujadidi, Anusha Nana, Peter O’Reilly, Sherman D. Padayachee, Ana Maria Pittella, Emma Plested, Katrina M. Pollock, Maheshi Ramasamy, Sarah Rhead, Alexandre Vargas Schwarzbold, Nisha Singh, Darren Smith, Rinn Song, Matthew D. Snape, Eduardo Sprinz, Rebecca Sutherland, Richard Tarrant, Emma C. Thomson, M. Estée Török, Mark Toshner, David P. J. Turner, Johan Vekemans, Tonya Villafana, Marion Watson, Christopher J. Williams, Alexander D. Douglas, Adrian V. S. Hill, Teresa Lambe, Sarah C. Gilbert, Andrew J. Pollard, Marites Aban, Fatola Abayomi, Kushala W.M. Abeyskera, Jeremy Aboagye, Matthew Adam, Kirsty Adams, James P. Adamson, Yemi Adelaja, Gbadebo Adewetan, Syed Adlou, Khatija Ahmed, Yasmeen Akhalwaya, Saajida Akhalwaya, Andrew Alcock, Aabidah Ali, Elizabeth Allen, Lauren Allen, Thamires C. D. S. C Almeida. Safety and efficacy of the ChAdOx1 nCoV-19 vaccine (AZD1222) against SARS-CoV-2: an interim analysis of four randomised controlled trials in Brazil, South Africa, and the UK. 2020. https://doi.org/10.1016/s0140-6736(20)32661-1
Evaluates efficacy based primarily on a two-dose vaccine regimen.
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Pedro M. Folegatti, Katie Ewer, Parvinder K. Aley, Brian Angus, Stephan Becker, Sandra Belij‐Rammerstorfer, Duncan Bellamy, Sagida Bibi, Mustapha Bittaye, Elizabeth Clutterbuck, Christina Dold, Saul N. Faust, Adam Finn, Amy Flaxman, Bassam Hallis, Paul T. Heath, Daniel Jenkin, Rajeka Lazarus, Rebecca Makinson, Angela M. Minassian, Katrina M. Pollock, Maheshi Ramasamy, Hannah Robinson, Matthew D. Snape, Richard Tarrant, Merryn Voysey, Catherine Green, Alexander D. Douglas, Adrian V. S. Hill, Teresa Lambe, Sarah C. Gilbert, Andrew J. Pollard, Jeremy Aboagye, K. F. Adams, Aabidah Ali, Elizabeth Allen, Jennifer L. Allison, Rachel Anslow, Edward H. Arbe-Barnes, Gavin Babbage, J. Kenneth Baillie, Megan Baker, Natalie Baker, Philip Baker, Ioana Baleanu, Juliana Ballaminut, Eleanor Barnes, Jordan R. Barrett, Louise Bates, Alexander Batten, Kirsten Beadon, Rebecca Beckley, Eleanor Berrie, Lisa Berry, Amy Beveridge, Kevin R. Bewley, Else M. Bijker, Tracey Bingham, Luke Blackwell, Caitlin L. Blundell, Emma Bolam, Elena Boland, Nicola Borthwick, Thomas Bower, Amy Boyd, Tanja Brenner, Philip Bright, Charlie Brown-O’Sullivan, Emily Brunt, Jamie Burbage, Sharon Burge, Karen R. Buttigieg, Nicholas Byard, Ingrid Cabera Puig, Anna Calvert, Susana Camara, Michelangelo Cao, Federica Cappuccini, Melanie Carr, Miles W. Carroll, Victoria Carter, Katrina Cathie, Ruth Challis, Sue Charlton, Irina Chelysheva, Jee-Sun Cho, Paola Cicconi, Liliana Cifuentes, Helen Clark, Elizabeth Clark, Tom Cole, Rachel Colin-Jones, Christopher P. Conlon, Aislinn Cook, Naomi S. Coombes, Rachel Cooper, Catherine A. Cosgrove, Karen Coy, Wendy E.M. Crocker, Christina J. Cunningham. Safety and immunogenicity of the ChAdOx1 nCoV-19 vaccine against SARS-CoV-2: a preliminary report of a phase 1/2, single-blind, randomised controlled trial. 2020. https://doi.org/10.1016/s0140-6736(20)31604-4
Demonstrates that antibody and neutralising responses are boosted significantly following a second dose.
Merryn Voysey, Sue Ann Costa Clemens, Shabir A. Madhi, Lily Yin Weckx, Pedro M. Folegatti, Parvinder K. Aley, Brian Angus, Vicky L. Baillie, Shaun Barnabas, Qasim Bhorat, Sagida Bibi, Carmen Briner, Paola Cicconi, Elizabeth Clutterbuck, Andrea M. Collins, Clare Cutland, Thomas C. Darton, Keertan Dheda, Christina Dold, C.J. Duncan, Katherine R. W. Emary, Katie Ewer, Amy Flaxman, Lee Fairlie, Saul N. Faust, Shuo Feng, Daniela M. Ferreira, Adam Finn, Eva Galiza, Anna L. Goodman, Catherine Green, Christopher Green, Melanie Greenland, Catherine Hill, Helen Hill, Ian Hirsch, Alane Izu, Daniel Jenkin, Carina C. D. Joe, Simon Kerridge, Anthonet Koen, Gaurav Kwatra, Rajeka Lazarus, Vincenzo Libri, Patrick Lillie, Natalie G. Marchevsky, Richard P. Marshall, Ana Verena Almeida Mendes, Eveline Pı́polo Milan, Angela M. Minassian, Alastair McGregor, Yama F Mujadidi, Anusha Nana, Sherman D. Padayachee, Daniel J. Phillips, Ana Maria Pittella, Emma Plested, Katrina M. Pollock, Maheshi Ramasamy, Adam Ritchie, Hannah Robinson, Alexandre Vargas Schwarzbold, Darren Smith, Rinn Song, Matthew D. Snape, Eduardo Sprinz, Rebecca Sutherland, Emma C. Thomson, M. Estée Török, Mark Toshner, David P. J. Turner, Johan Vekemans, Tonya Villafana, Thomas White, Christopher J. Williams, Alexander D. Douglas, Adrian V. S. Hill, Teresa Lambe, Sarah C. Gilbert, Andrew J. Pollard, Marites Aban, Kushala W.M. Abeyskera, Jeremy Aboagye, Matthew Adam, Kirsty Adams, James P. Adamson, Gbadebo Adewatan, Syed Adlou, Khatija Ahmed, Yasmeen Akhalwaya, Saajida Akhalwaya, Andrew Alcock, Aabidah Ali, Elizabeth Allen, Lauren Allen, Felipe B. Alvernaz, Fabio Santos Amorim, Claudia Sala Andrade, Foteini Andritsou, Rachel Anslow. Single-dose administration and the influence of the timing of the booster dose on immunogenicity and efficacy of ChAdOx1 nCoV-19 (AZD1222) vaccine: a pooled analysis of four randomised trials. 2021. https://doi.org/10.1016/s0140-6736(21)00432-3
Confirms efficacy findings based on standard two-dose administration intervals.
Benedikt Simon, Harald Rubey, Andreas Treipl, Martin Gromann, Boris Hemedi, S. Zehetmayer, Bernhard M Kirsch. Haemodialysis patients show a highly diminished antibody response after COVID-19 mRNA vaccination compared to healthy controls. 2021. https://doi.org/10.1093/ndt/gfab179
Assesses vaccine effectiveness and antibody responses specifically following the recommended two-dose vaccination schedule.
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