1
|
Lopez P, Bravo L, Buntinx E, Borja-Tabora C, Velasquez H, Rodriquez EJ, Rodriguez CA, Carlos J, Montellano MEB, Alberto ER, Salvani-Bautista M, Huang Y, Hu B, Li P, Han HH, Baccarini C, Smolenov I. Safety and immunogenicity of SCB-2019, an adjuvanted, recombinant SARS-CoV-2 trimeric S-protein subunit COVID-19 vaccine in healthy 12-17 year-old adolescents. Hum Vaccin Immunother 2023:2206359. [PMID: 37226504 DOI: 10.1080/21645515.2023.2206359] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023] Open
Abstract
We previously demonstrated the efficacy of the COVID-19 vaccine candidate, SCB-2019, in adults in the SPECTRA phase 2/3 efficacy study. We extended the study to include 1278 healthy 12-17-year-old adolescents in Belgium, Colombia, and the Philippines who received either two doses of SCB-2019 or placebo 21 days apart, to assess immunogenicity as neutralizing antibodies against prototype SARS-CoV-2 and variants of concern, and safety and reactogenicity as solicited and unsolicited adverse events with a comparator group of young adults (18-25 years). In participants with no evidence of prior SARS-CoV-2 infection SCB-2019 immunogenicity in adolescents was non-inferior to that in young adults; respective geometric mean neutralizing titers (GMT) against prototype SARS-CoV-2 14 days after the second vaccination were 271 IU/mL (95% CI: 211-348) and 144 IU/mL (116-178). Most adolescents (1077, 84.3%) had serologic evidence of prior SAR-CoV-2 exposure at baseline; in these seropositive adolescents neutralizing GMTs increased from 173 IU/mL (135-122) to 982 IU/mL (881-1094) after the second dose. Neutralizing titers against Delta and Omicron BA SARS-CoV-2 variants were also increased, most notably in those with prior exposure. SCB-2019 vaccine was well tolerated with generally mild or moderate, transient solicited and unsolicited adverse events that were comparable in adolescent vaccine and placebo groups except for injection site pain - reported after 20% of SCB-2019 and 7.3% of placebo injections. SCB-2019 vaccine was highly immunogenic against SARS-CoV-2 prototype and variants in adolescents, especially in those with evidence of prior exposure, with comparable immunogenicity to young adults. Clinical trial registration: EudraCT 2020-004272-17; ClinicalTrials.gov NCT04672395.
Collapse
Affiliation(s)
- Pio Lopez
- Centro de Estudios en Infectología Pediátrica, Universidad Del Valle Clínica Imbanaco, Cali, Colombia
| | - Lulu Bravo
- College of Medicine, University of the Philippines Manila, Ermita, The Philippines
| | | | | | - Hector Velasquez
- Center of Attention in Medical Research (CAIMED), Bogotá, Colombia
| | | | | | - Josefina Carlos
- University of the East Ramon Magsaysay Memorial Medical Center, Quezon City, The Philippines
| | | | | | | | - Yung Huang
- Clover Biopharmaceuticals, Boston, MA, USA
| | - Branda Hu
- Clover Biopharmaceuticals, Boston, MA, USA
| | - Ping Li
- Clover Biopharmaceuticals, Boston, MA, USA
| | | | | | | |
Collapse
|