Safety and immunogenicity of an rAd26 and rAd5 vector-based heterologous prime-boost COVID-19 vaccine in two formulations: two open, non-randomised phase 1/2 studies from Russia
Item
Click for External Resource*
Click to read full article*
*The link above may share a zip file (.zip) hosted on repository.netecweb.org. Zip files will download automatically.
*All other links are external and will open in a new window. If you click an external link, you are leaving the NETEC site, and we do not maintain, review, or endorse these materials. See our terms of use.
Item Type
PublicationTerms of Use
By accessing these materials you are agreeing to our terms of use, which may be found here: Terms of Use.
Title
Safety and immunogenicity of an rAd26 and rAd5 vector-based heterologous prime-boost COVID-19 vaccine in two formulations: two open, non-randomised phase 1/2 studies from Russia
Subject
Description
We developed a heterologous COVID-19 vaccine consisting of two components, a recombinant adenovirus type 26 (rAd26) vector and a recombinant adenovirus type 5 (rAd5) vector, both carrying the gene for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike glycoprotein (rAd26-S and rAd5-S).
Responses to this article were published:
Responses to this article were published:
- Bucci, Enrico, Konstantin Andreev, Anders Björkman, Raffaele Adolfo Calogero, Ernesto Carafoli, Piero Carninci, Paola Castagnoli, Andrea Cossarizza, Cristina Mussini, Philippe Guerin, Brian Lipworth, Gianluca Sbardella, Teresa Stocki, Loretta Tuosto, Christoffer van Tulleken, and Antonella Viola. "Safety and efficacy of the Russian COVID-19 vaccine: more information needed." The Lancet.
- Logunov, Denis Y., Inna V. Dolzhikova, Amir I. Tukhvatullin, and Dmitry V. Shcheblyakov. 2020. "Safety and efficacy of the Russian COVID-19 vaccine: more information needed - Authors' reply." The Lancet.
Date
2020-09-21
Type
Citation
Logunov, Denis Y., Inna V. Dolzhikova, Olga V. Zubkova, Amir I. Tukhvatullin, Dmitry V. Shcheblyakov, Alina S. Dzharullaeva, Daria M. Grousova, Alina S. Erokhova, Anna V. Kovyrshina, Andrei G. Botikov, Fatima M. Izhaeva, Olga Popova, Tatiana A. Ozharovskaya, Ilias B. Esmagambetov, Irina A. Favorskaya, Denis I. Zrelkin, Daria V. Voronina, Dmitry N. Shcherbinin, Alexander S. Semikhin, Yana V. Simakova, Elizaveta A. Tokarskaya, Nadezhda L. Lubenets, Daria A. Egorova, Maksim M. Shmarov, Natalia A. Nikitenko, Lola F. Morozova, Elena A. Smolyarchuk, Evgeny V. Kryukov, Vladimir F. Babira, Sergei V. Borisevich, Boris S. Naroditsky, and Alexander L. Gintsburg. 2020. "Safety and immunogenicity of an rAd26 and rAd5 vector-based heterologous prime-boost COVID-19 vaccine in two formulations: two open, non-randomised phase 1/2 studies from Russia." The Lancet.
Abstract
Summary
Background
We developed a heterologous COVID-19 vaccine consisting of two components, a recombinant adenovirus type 26 (rAd26) vector and a recombinant adenovirus type 5 (rAd5) vector, both carrying the gene for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike glycoprotein (rAd26-S and rAd5-S). We aimed to assess the safety and immunogenicity of two formulations (frozen and lyophilised) of this vaccine.
Methods
We did two open, non-randomised phase 1/2 studies at two hospitals in Russia. We enrolled healthy adult volunteers (men and women) aged 18–60 years to both studies. In phase 1 of each study, we administered intramuscularly on day 0 either one dose of rAd26-S or one dose of rAd5-S and assessed the safety of the two components for 28 days. In phase 2 of the study, which began no earlier than 5 days after phase 1 vaccination, we administered intramuscularly a prime-boost vaccination, with rAd26-S given on day 0 and rAd5-S on day 21. Primary outcome measures were antigen-specific humoral immunity (SARS-CoV-2-specific antibodies measured by ELISA on days 0, 14, 21, 28, and 42) and safety (number of participants with adverse events monitored throughout the study). Secondary outcome measures were antigen-specific cellular immunity (T-cell responses and interferon-γ concentration) and change in neutralising antibodies (detected with a SARS-CoV-2 neutralisation assay). These trials are registered with ClinicalTrials.gov, NCT04436471 and NCT04437875.
Findings
Between June 18 and Aug 3, 2020, we enrolled 76 participants to the two studies (38 in each study). In each study, nine volunteers received rAd26-S in phase 1, nine received rAd5-S in phase 1, and 20 received rAd26-S and rAd5-S in phase 2. Both vaccine formulations were safe and well tolerated. The most common adverse events were pain at injection site (44 [58%]), hyperthermia (38 [50%]), headache (32 [42%]), asthenia (21 [28%]), and muscle and joint pain (18 [24%]). Most adverse events were mild and no serious adverse events were detected. All participants produced antibodies to SARS-CoV-2 glycoprotein. At day 42, receptor binding domain-specific IgG titres were 14 703 with the frozen formulation and 11 143 with the lyophilised formulation, and neutralising antibodies were 49·25 with the frozen formulation and 45·95 with the lyophilised formulation, with a seroconversion rate of 100%. Cell-mediated responses were detected in all participants at day 28, with median cell proliferation of 2·5% CD4+ and 1·3% CD8+ with the frozen formulation, and a median cell proliferation of 1·3% CD4+ and 1·1% CD8+ with the lyophilised formulation.
Interpretation
The heterologous rAd26 and rAd5 vector-based COVID-19 vaccine has a good safety profile and induced strong humoral and cellular immune responses in participants. Further investigation is needed of the effectiveness of this vaccine for prevention of COVID-19.
Funding
Ministry of Health of the Russian Federation.
Accessibility
Free online on Lancet site.
Was this resource helpful?