1
|
Kremsner PG, Mann P, Kroidl A, Leroux-Roels I, Schindler C, Gabor JJ, Schunk M, Leroux-Roels G, Bosch JJ, Fendel R, Kreidenweiss A, Velavan TP, Fotin-Mleczek M, Mueller SO, Quintini G, Schönborn-Kellenberger O, Vahrenhorst D, Verstraeten T, Alves de Mesquita M, Walz L, Wolz OO, Oostvogels L. Safety and immunogenicity of an mRNA-lipid nanoparticle vaccine candidate against SARS-CoV-2 : A phase 1 randomized clinical trial. Wien Klin Wochenschr 2021; 133:931-941. [PMID: 34378087 PMCID: PMC8354521 DOI: 10.1007/s00508-021-01922-y] [Citation(s) in RCA: 56] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Accepted: 07/07/2021] [Indexed: 01/20/2023]
Abstract
BACKGROUND We used the RNActive® technology platform (CureVac N.V., Tübingen, Germany) to prepare CVnCoV, a COVID-19 vaccine containing sequence-optimized mRNA coding for a stabilized form of SARS-CoV‑2 spike (S) protein encapsulated in lipid nanoparticles (LNP). METHODS This is an interim analysis of a dosage escalation phase 1 study in healthy 18-60-year-old volunteers in Hannover, Munich and Tübingen, Germany, and Ghent, Belgium. After giving 2 intramuscular doses of CVnCoV or placebo 28 days apart we assessed solicited local and systemic adverse events (AE) for 7 days and unsolicited AEs for 28 days after each vaccination. Immunogenicity was measured as enzyme-linked immunosorbent assay (ELISA) IgG antibodies to SARS-CoV‑2 S‑protein and receptor binding domain (RBD), and SARS-CoV‑2 neutralizing titers (MN50). RESULTS In 245 volunteers who received 2 CVnCoV vaccinations (2 μg, n = 47, 4 μg, n = 48, 6 μg, n = 46, 8 μg, n = 44, 12 μg, n = 28) or placebo (n = 32) there were no vaccine-related serious AEs. Dosage-dependent increases in frequency and severity of solicited systemic AEs, and to a lesser extent local AEs, were mainly mild or moderate and transient in duration. Dosage-dependent increases in IgG antibodies to S‑protein and RBD and MN50 were evident in all groups 2 weeks after the second dose when 100% (23/23) seroconverted to S‑protein or RBD, and 83% (19/23) seroconverted for MN50 in the 12 μg group. Responses to 12 μg were comparable to those observed in convalescent sera from known COVID-19 patients. CONCLUSION In this study 2 CVnCoV doses were safe, with acceptable reactogenicity and 12 μg dosages elicited levels of immune responses that overlapped those observed in convalescent sera.
Collapse
Affiliation(s)
- Peter G Kremsner
- Institute of Tropical Medicine, University Hospital Tübingen, Tübingen, Germany
- German Centre for Infection Research (DZIF), partner site Tübingen, Tübingen, Germany
- Centre de Recherches Medicales de Lambarene, Lambarene, Gabon
| | - Philipp Mann
- CureVac AG, Schumannstraße 27, 60325, Frankfurt, Germany.
| | - Arne Kroidl
- Division of Infectious Diseases and Tropical Medicine, University Hospital, LMU Munich, Munich, Germany
- German Centre for Infection Research (DZIF), partner site Munich, Munich, Germany
| | | | | | - Julian J Gabor
- Institute of Tropical Medicine, University Hospital Tübingen, Tübingen, Germany
| | - Mirjam Schunk
- Division of Infectious Diseases and Tropical Medicine, University Hospital, LMU Munich, Munich, Germany
- German Centre for Infection Research (DZIF), partner site Munich, Munich, Germany
| | | | | | - Rolf Fendel
- Institute of Tropical Medicine, University Hospital Tübingen, Tübingen, Germany
- German Centre for Infection Research (DZIF), partner site Tübingen, Tübingen, Germany
| | - Andrea Kreidenweiss
- Institute of Tropical Medicine, University Hospital Tübingen, Tübingen, Germany
- German Centre for Infection Research (DZIF), partner site Tübingen, Tübingen, Germany
| | - Thirumalaisamy P Velavan
- Institute of Tropical Medicine, University Hospital Tübingen, Tübingen, Germany
- Vietnamese-German Center for Medical Research (VG-CARE), Hanoi, Viet Nam
| | | | | | | | | | | | | | | | - Lisa Walz
- CureVac AG, Schumannstraße 27, 60325, Frankfurt, Germany
| | | | | |
Collapse
|