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. 2023 May 5;133:18–26. doi: 10.1016/j.ijid.2023.04.407

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© 2023 The Author(s)

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Factors associated with reporting a SARS-CoV-2 infection between March and June 2022. Multivariable logistic regression modeling was used to assess the relationship between gender (female vs male), age group (65+ vs 16-64 years), quantiles of S- or N-IgG, N-Ab Titers, or S- or M/N-T cell IFN-gamma levels in March 2022, and reporting a previous SARS-CoV-2 infection (positive polymerase chain reaction or antigen test) (yes vs no) in June/July 2022. For S- and N-IgG MFI ratio titers, individuals were assigned to one of three expression quantiles (<33%, 33-67%, 67+% of all participants); for N-Ab IC50 values, and S- and M/N-T cell IFN-gamma levels, individuals were assigned to one of four expression quantiles (<25%, 25->50%, 50->75%, 75+% of all participants). Corresponding MFI ratios/IC50 titers/IFN-gamma levels are listed next to each variable. *P >0.05, ***P >0.005. CI, confidence interval; IC, inhibitory concentration; IFN, interferon; Ig, immunoglobulin; M, membrane; MFI, mean fluorescence intensity; N, nucleocapsid; N-Ab, neutralizing antibody; S, spike; TC, T cell; WT, wildtype.