부산대학교 도서관

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent of Coronavirus Disease 2019 (COVID-19), has caused a global pandemic, and safe, effective vaccines are urgently needed.sup.1. Strong, Th1-skewed T cell responses can drive protective humoral and cell-mediated immune responses.sup.2 and might reduce the potential for disease enhancement.sup.3. Cytotoxic T cells clear virus-infected host cells and contribute to control of infection.sup.4. Studies of patients infected with SARS-CoV-2 have suggested a protective role for both humoral and cell-mediated immune responses in recovery from COVID-19 (refs. .sup.5,6). ChAdOx1 nCoV-19 (AZD1222) is a candidate SARS-CoV-2 vaccine comprising a replication-deficient simian adenovirus expressing full-length SARS-CoV-2 spike protein. We recently reported preliminary safety and immunogenicity data from a phase 1/2 trial of the ChAdOx1 nCoV-19 vaccine (NCT04400838).sup.7 given as either a one- or two-dose regimen. The vaccine was tolerated, with induction of neutralizing antibodies and antigen-specific T cells against the SARS-CoV-2 spike protein. Here we describe, in detail, exploratory analyses of the immune responses in adults, aged 18-55 years, up to 8 weeks after vaccination with a single dose of ChAdOx1 nCoV-19 in this trial, demonstrating an induction of a Th1-biased response characterized by interferon-[gamma] and tumor necrosis factor-[alpha] cytokine secretion by CD4.sup.+ T cells and antibody production predominantly of IgG1 and IgG3 subclasses. CD8.sup.+ T cells, of monofunctional, polyfunctional and cytotoxic phenotypes, were also induced. Taken together, these results suggest a favorable immune profile induced by ChAdOx1 nCoV-19 vaccine, supporting the progression of this vaccine candidate to ongoing phase 2/3 trials to assess vaccine efficacy. A single dose of the ChAdOx1 nCoV-19 vaccine elicits antibodies and cytokine-producing T cells that might help control or prevent SARS-CoV-2 infection.
Author(s): Katie J. Ewer [sup.1] , Jordan R. Barrett [sup.1] , Sandra Belij-Rammerstorfer [sup.1] , Hannah Sharpe [sup.1] , Rebecca Makinson [sup.1] , Richard Morter [sup.1] , Amy Flaxman [sup.1] [...]