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Hernández-Bernal F, Ricardo-Cobas MC, Martín-Bauta Y, Rodríguez-Martínez E, Urrutia-Pérez K, Urrutia-Pérez K, Quintana-Guerra J, Navarro-Rodríguez Z, Piñera-Martínez M, Rodríguez-Reinoso JL, Chávez-Chong CO, Baladrón-Castrillo I, Melo-Suárez G, Batista-Izquierdo A, Pupo-Micó A, Mora-Betancourt R, Bizet-Almeida J, Martínez-Rodríguez MC, Lobaina-Lambert L, Velázquez-Pérez VM, Soler-Díaz J, Laurencio-Vallina S, Meriño-Hechavarría T, Carmenaty-Campos N, Rodríguez-Montero E, Limonta-Fernández M, Alonso-Valdés M, Hernández-Rodríguez R, Pimentel-Vázquez E, Catasús-Álvarez KM, Cabrera-Núñez MV, Ayala-Ávila M, Muzio-González VL. A phase 3, randomised, double-blind, placebo-controlled clinical trial evaluation of the efficacy and safety of a SARS-CoV-2 recombinant spike RBD protein vaccine in adults (ABDALA-3 study). Lancet Reg Health Am 2023; 21:100497. [PMID: 37192953 PMCID: PMC10160525 DOI: 10.1016/j.lana.2023.100497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 03/28/2023] [Accepted: 04/14/2023] [Indexed: 05/18/2023]
Abstract
Background The pandemic of COVID-19 raised the urgent need for safe and efficacious vaccines against SARS-CoV-2. We evaluated the efficacy and safety of a new SARS-CoV-2 virus receptor-binding domain (RBD) vaccine. Methods A phase 3, multicentre, randomised, double-blind, placebo-controlled trial was carried out at 18 clinical sites in three provinces of the south-eastern region of Cuba. Subjects (healthy or those with controlled chronic diseases) aged between 19 and 80 years, who gave written informed consent were eligible. Subjects were randomly assigned (1:1, in blocks) to two groups: placebo, and 50 μg RBD vaccine (Abdala). The product was administered intramuscularly, 0.5 mL in the deltoid region, in a three-dose immunization schedule at 0-14-28 days. The organoleptic characteristics and presentations of the vaccine and placebo were identical. All participants (subjects, clinical researchers, statisticians, laboratory technicians, and monitors) remained blinded during the study period. The main endpoint was to evaluate the efficacy of the Abdala vaccine in the prevention of symptomatic COVID-19. The trial is registered with the Cuban Public Registry of Clinical Trials, RPCEC00000359. Findings Between March 22 to April 03, 2021, 48,290 subjects were included (24,144 and 24,146 in the placebo and Abdala groups, respectively) in the context of predominant D614G variant circulation. The evaluation of the main efficacy outcomes occurred during May-June 2021, starting at May 3rd, in the context of high circulation of mutant viruses, predominantly VOC Beta. The incidence of adverse reactions for individuals in the placebo and Abdala vaccine groups were 1227/24,144 (5.1%) and 1621/24,146 (6.7%), respectively. Adverse reactions were mostly mild, and from the injection site, which resolved in the first 24-48 h. No severe adverse events with demonstrated cause-effect relationship attributable to the vaccine were reported. Symptomatic COVID-19 disease was confirmed in 142 participants in the placebo group (78.44 incidence per 1000 person-years, 95% confidence interval [CI], 66.07-92.46) and in 11 participants in Abdala vaccine group (6.05 incidence per 1000 person years; 95% CI 3.02-10.82). The Abdala vaccine efficacy against symptomatic COVID-19 was 92.28% (95% CI 85.74-95.82). Moderate/serious forms of COVID-19 occurred in 30 participants (28 in the placebo group and only 2 in the Abdala vaccine group) for a vaccine efficacy of 92.88% (95% CI 70.12-98.31). There were five critical patients (of which four died), all in the placebo group. Interpretation The Abdala vaccine was safe, well tolerated, and highly effective, fulfilling the WHO target product profile for COVID-19 vaccines. Those results, along with its immunization schedule and the advantage of easy storage and handling conditions at 2-8 °C, make this vaccine an option for the use in immunization strategies as a key tool for the control of the pandemic. Funding Centre for Genetic Engineering and Biotechnology (CIGB), Havana, Cuba.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Maria V. Cabrera-Núñez
- Virology Laboratory of the Center for Hygiene, Epidemiology and Microbiology, Santiago de Cuba, Cuba
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Mou D, Feng H, Cao R, Weng X, Zhao L, Yang L, Jin R, Chen W. Profile of specific antibodies to the SARS-CoV-2. J Med Microbiol 2021; 70:001335. [PMID: 33734961 PMCID: PMC8346729 DOI: 10.1099/jmm.0.001335] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 02/08/2021] [Indexed: 11/30/2022] Open
Abstract
In this work, we studied the profile of IgM and IgG antibody responses to SARS-CoV-2 in 32 patients with COVID-19 from day 1 to day 24. IgM remained measurable for a much shorter period than IgG, suggesting that IgG antibody may represent the primary immune response.
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Affiliation(s)
- Danlei Mou
- Beijing Youan Hospital, Capital Medical University, Beijing, PR China
| | - Huahua Feng
- BGI PathoGenesis Pharmaceutical Technology, BGI-Shenzhen, Shenzhen, Guangdong, PR China
| | - Ruiyuan Cao
- National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, PR China
| | - Xing Weng
- BGI PathoGenesis Pharmaceutical Technology, BGI-Shenzhen, Shenzhen, Guangdong, PR China
| | - Lizhe Zhao
- BGI PathoGenesis Pharmaceutical Technology, BGI-Shenzhen, Shenzhen, Guangdong, PR China
| | - Lingling Yang
- BGI PathoGenesis Pharmaceutical Technology, BGI-Shenzhen, Shenzhen, Guangdong, PR China
| | - Ronghua Jin
- Beijing Youan Hospital, Capital Medical University, Beijing, PR China
| | - Weijun Chen
- BGI PathoGenesis Pharmaceutical Technology, BGI-Shenzhen, Shenzhen, Guangdong, PR China
- BGI Education Center, University of Chinese Academy of Sciences, Beishan Industry Area 11, Shenzhen, PR China
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