Correlates of Durability and Boosting Following Ad26.COV2.S Immunization in Rhesus Macaques
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ABSTRACT: Ad26.COV2.S is a single-shot vaccine with clinical efficacy against symptomatic COVID-19. In this study, we report the correlates of durability of humoral and cellular immune responses in 20 rhesus macaques immunized with single-shot Ad26.COV2.S and the immunogenicity of a booster shot at 8-10 months following the initial immunization. Innate immune responses, memory B cell responses, and bone marrow plasma cell responses correlated with durable antibody responses following initial vaccination. Following Ad26.COV2.S boost immunization, binding and neutralizing antibody responses increased 31-69 fold and 23-43 fold, respectively, compared with pre-boost levels against multiple SARS-CoV-2 variants, including the delta variant. Antigen-specific B cell and T cell responses also increased. Humoral and cellular immune responses were largely comparable for ancestral, alpha, beta, gamma, delta, and kappa SARS-CoV-2 variants following the boost immunization. Boosting with a modified Ad26.COV2.S.351 vaccine expressing the SARS-CoV-2 beta Spike led to largely comparable responses. These data demonstrate that a late boost with Ad26.COV2.S in rhesus macaques resulted in a dramatic increase in humoral and cellular immune responses that were highly cross-reactive across multiple SARS-CoV-2 variants.
ORGANISM(S): Macaca mulatta
PROVIDER: GSE193264 | GEO | 2022/02/10
REPOSITORIES: GEO
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