| Literature DB >> 35429381 |
Mathieu Le Gars1, Jerald Sadoff1, Frank Struyf2, Dirk Heerwegh2, Carla Truyers2, Jenny Hendriks1, Glenda Gray3, Beatriz Grinsztejn4, Paul A Goepfert5, Hanneke Schuitemaker1, Macaya Douoguih1.
Abstract
This secondary analysis of the phase 3 ENSEMBLE trial (NCT04505722) assessed the impact of preexisting humoral immunity to adenovirus 26 (Ad26) on the immunogenicity of Ad26.COV2.S-elicited severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)-specific antibody levels in 380 participants in Brazil, South Africa, and the United States. Among those vaccinated in Brazil and South Africa, 31% and 66%, respectively, had prevaccination serum-neutralizing activity against Ad26, with little preexisting immunity detected in the United States. Vaccine recipients in each country had similar postvaccination spike (S) protein-binding antibody levels, indicating that baseline immunity to Ad26 has no clear impact on vaccine-induced immune responses.Entities:
Keywords: Ad26.COV2.S; COVID-19; SARS-CoV-2; preexisting immunity; vaccine
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Year: 2022 PMID: 35429381 PMCID: PMC9047246 DOI: 10.1093/infdis/jiac142
Source DB: PubMed Journal: J Infect Dis ISSN: 0022-1899 Impact factor: 7.759