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Reinkemeyer, C.* ; Khazaei, H.* ; Weigert, M.* ; Hannes, M.* ; Le Gleut, R. ; Plank, M.* ; Winter, S.* ; Noreña, I.* ; Meier, T.* ; Xu, L.* ; Rubio-Acero, R.* ; Wiegrebe, S.* ; Le Thi, T.G.* ; Fuchs, C. ; Radon, K.* ; Paunovic, I.* ; Janke, C.* ; Wieser, A.* ; Küchenhoff, H.* ; Hoelscher, M.* ; Castelletti, N.

The prospective COVID-19 post-immunization serological cohort in Munich (KoCo-Impf): Risk factors and determinants of immune response in healthcare workers.

Viruses 15:25 (2023)

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	Open Access Gold

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Antibody studies analyze immune responses to SARS-CoV-2 vaccination and infection, which is crucial for selecting vaccination strategies. In the KoCo-Impf study, conducted between 16 June and 16 December 2021, 6088 participants aged 18 and above from Munich were recruited to monitor antibodies, particularly in healthcare workers (HCWs) at higher risk of infection. Roche Elecsys^® Anti-SARS-CoV-2 assays on dried blood spots were used to detect prior infections (anti-Nucleocapsid antibodies) and to indicate combinations of vaccinations/infections (anti-Spike antibodies). The anti-Spike seroprevalence was 94.7%, whereas, for anti-Nucleocapsid, it was only 6.9%. HCW status and contact with SARS-CoV-2-positive individuals were identified as infection risk factors, while vaccination and current smoking were associated with reduced risk. Older age correlated with higher anti-Nucleocapsid antibody levels, while vaccination and current smoking decreased the response. Vaccination alone or combined with infection led to higher anti-Spike antibody levels. Increasing time since the second vaccination, advancing age, and current smoking reduced the anti-Spike response. The cumulative number of cases in Munich affected the anti-Spike response over time but had no impact on anti-Nucleocapsid antibody development/seropositivity. Due to the significantly higher infection risk faced by HCWs and the limited number of significant risk factors, it is suggested that all HCWs require protection regardless of individual traits.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Covid-19 ; Orchestra ; Sars-cov-2 ; Antibodies ; Breakthrough Infections ; Health Care Workers ; Immunologic Response ; Seroprevalence ; Vaccination

ISSN (print) / ISBN 1999-4915

e-ISSN 1999-4915

Journal Viruses

Quellenangaben Volume: 15, Issue: 7, Article Number: 25

Publisher MDPI

Publishing Place St Alban-anlage 66, Ch-4052 Basel, Switzerland

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Radiation Medicine (IRM)
Institute of Computational Biology (ICB)
CF Statistical Consulting (CF-STATCON)

Grants European Union