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Almanzar, G.* ; Koosha, K.* ; Vogt, T.* ; Stein, A.* ; Ziegler, L.* ; Asam, C.* ; Weps, M.* ; Schwägerl, V.* ; Richter, L.* ; Hepp, N.* ; Fuchs, A.* ; Wagenhäuser, I.* ; Reusch, J.* ; Krone, M.* ; Geldmacher, C.* ; Protzer, U. ; Steininger, P.* ; Überla, K.* ; Wagner, R.* ; Liese, J.* ; Prelog, M.*

Hybrid immunity by two COVID-19 mRNA vaccinations and one breakthrough infection provides a robust and balanced cellular immune response as basic immunity against severe acute respiratory syndrome coronavirus 2.

J. Med. Virol. 96:e29739 (2024)

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This longitudinal prospective controlled multicenter study aimed to monitor immunity generated by three exposures caused by breakthrough infections (BTI) after COVID-19-vaccination considering pre-existing cell-mediated immunity to common-corona-viruses (CoV) which may impact cellular reactivity against SARS-CoV-2. Anti-SARS-CoV-2-spike-IgG antibodies (anti-S-IgG) and cellular reactivity against Spike-(S)- and nucleocapsid-(N)-proteins were determined in fully-vaccinated (F) individuals who either experienced BTI (F+BTI) or had booster vaccination (F+Booster) compared to partially vaccinated (P+BTI) and unvaccinated (U) from 1 to 24 weeks post PCR-confirmed infection. High avidity anti-S-IgG were found in F+BTI compared to U, the latter exhibiting increased long-lasting pro-inflammatory cytokines to S-stimulation. CoV was associated with higher cellular reactivity in U, whereas no association was seen in F. The study illustrates the induction of significant S-specific cellular responses in F+BTI building-up basic immunity by three exposures. Only U seem to benefit from pre-existing CoV immunity but demonstrated inflammatory immune responses compared to F+BTI who immunologically benefit from enhanced humoral and cellular immunity after BTI. This study demonstrates that individuals with hybrid immunity from COVID-19-vaccination and BTI acquire a stable humoral and cellular immune response that is maintained for at least 6 months. Our findings corroborate recommendations by health authorities to build on basic immunity by three S-protein exposures.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Covid‐19 ; Sars‐cov‐2 ; Breakthrough Infection ; Common Corona Viruses ; Hybrid Immunity ; Mrna Vaccination

ISSN (print) / ISBN 0146-6615

e-ISSN 1096-9071

Journal Journal of Medical Virology

Quellenangaben Volume: 96, Issue: 6, Article Number: e29739

Publisher Wiley

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Virology (VIRO)

Grants Bavarian State Ministry of Science and the Arts for the CoVaKo project