Antigen-based multiplex strategies to discriminate SARS-CoV-2 natural and vaccine induced immunity from seasonal human coronavirus humoral responses
Author:
Laing Eric D., Sterling Spencer L., Richard Stephanie A., Epsi Nusrat J., Coggins Si’Ana, Samuels Emily C., Phogat Shreshta, Yan Lianying, Moreno Nicole, Coles Christian L., Drew Matthew, Mehalko Jennifer, English Caroline E., Merritt Scott, Mende Katrin, Munster Vincent J.ORCID, Wit Emmie de, Chung Kevin K., Millar Eugene V., Tribble David R., Simons Mark P., Pollett Simon D., Agan Brian K., Esposito Dominic, Lanteri Charlotte, Clifton G. Travis, Mitre Edward, Burgess Timothy H., Broder Christopher C.
Abstract
ABSTRACTSensitive and specific SARS-CoV-2 antibody assays remain critical for community and hospital-based SARS-CoV-2 sero-surveillance. With the rollout of SARS-CoV-2 vaccines, such assays must be able to distinguish vaccine from natural immunity to SARS-CoV-2 and related human coronaviruses. Here, we developed and implemented multiplex microsphere-based immunoassay strategies for COVD-19 antibody studies that incorporates spike protein trimers of SARS-CoV-2 and the endemic seasonal human coronaviruses (HCoV), enabling high throughout measurement of pre-existing cross-reactive antibodies. We varied SARS-CoV-2 antigen compositions within the multiplex assay, allowing direct comparisons of the effects of spike protein, receptor-binding domain protein (RBD) and nucleocapsid protein (NP) based SARS-CoV-2 antibody detection. Multiplex immunoassay performance characteristics are antigen-dependent, and sensitivities and specificities range 92-99% and 94-100%, respectively, for human subject samples collected as early as 7-10 days from symptom onset. SARS-CoV-2 spike and RBD had a strong correlative relationship for the detection of IgG. Correlation between detectable IgG reactive with spike and NP also had strong relationship, however, several PCR-positive and spike IgG-positive serum samples were NP IgG-negative. This spike and NP multiplex immunoassay has the potential to be useful for differentiation between vaccination and natural infection induced antibody responses. We also assessed the induction ofde novoSARS-CoV-2 IgG cross reactions with SARS-CoV and MERS-CoV spike proteins. Furthermore, multiplex immunoassays that incorporate spike proteins of SARS-CoV-2 and HCoVs will permit investigations into the influence of HCoV antibodies on COVID-19 clinical outcomes and SARS-CoV-2 antibody durability.
Publisher
Cold Spring Harbor Laboratory
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