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© 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Background/Objectives: This study examines the longitudinal dynamics of anti-nucleocapsid (anti-N) and anti-spike (anti-S) antibody responses to SARS-CoV-2 infection and mRNA vaccination based on 81,878 serum samples from 23,616 healthcare workers (HCWs) across five European countries. It includes data across four scheduled vaccine doses—predominantly BNT162b2—with 25% of samples originating from individuals with confirmed prior infection, as evidenced by elevated anti-S levels, positive Anti-N antibodies, or PCR results. Methods: The study employed a shifted transformation method for data normalization and utilized the Bass diffusion model to predict antibody titer dynamics influenced by both internal factors—such as immune activation contextualized through sociodemographic issues—and external factors, including infection and vaccination. Despite the absence of direct measurements for some internal variables, the model effectively inferred their impact, enabling a rigorous and nuanced delineation of immune response profiles. Results: The Bass diffusion model rigorously captured variations in antibody titers, analyzed through demographic factors such as gender, age, and job role, while thoroughly accounting for pre-infection status. The results indicate that Anti-N antibodies, exclusively produced post-infection, exhibited a rapid decline, while anti-S antibodies, generated from both infection and vaccination, demonstrated prolonged persistence. A significant decline in anti-S levels was observed 3–5 months post-vaccination, with adaptive immunity—characterized by the dominance of internal factors effects relative to external ones—achieved in most groups after the fourth dose. However, adaptive immunity post second dose was limited to specific demographics. Conclusions: These findings emphasize the significance of the Bass Method in predicting vaccine-induced, hybrid immune responses and detecting adaptive immunity by overcoming limitations in internal factor data, thereby advancing effective vaccination and infection control strategies during public health crises. These findings highlight the Bass Method’s value in predicting vaccine-induced and hybrid immunity, effectively addressing internal factor data gaps to enhance vaccination and infection control strategies.

Details

Title
Antibody Kinetics of Immunological Memory in SARS-CoV-2-Vaccinated Healthcare Workers—The ORCHESTRA Project
Author
Seyedi Seyedalireza 1   VIAFID ORCID Logo  ; Sottile, Sara 2 ; Abedini Mahsa 2 ; Boffetta Paolo 3   VIAFID ORCID Logo  ; Violante, Francesco Saverio 2   VIAFID ORCID Logo  ; Lodi Vittorio 4 ; De Palma Giuseppe 5   VIAFID ORCID Logo  ; Sala, Emma 5   VIAFID ORCID Logo  ; Mauro, Marcella 6   VIAFID ORCID Logo  ; Rui, Francesca 6   VIAFID ORCID Logo  ; Porru Stefano 7   VIAFID ORCID Logo  ; Spiteri Gianluca 8   VIAFID ORCID Logo  ; Vimercati Luigi 9   VIAFID ORCID Logo  ; De, Maria Luigi 9   VIAFID ORCID Logo  ; Toran-Monserrat Pere 10 ; Violán Concepción 11   VIAFID ORCID Logo  ; Fabiánová Eleonóra 12   VIAFID ORCID Logo  ; Oravec Bérešová Jana 13   VIAFID ORCID Logo  ; Calota Violeta 14 ; Neamtu Andra 14 

 Department of Economics, University of Bologna, 40126 Bologna, Italy; [email protected], Department of Medical and Surgical Sciences, University of Bologna, 40126 Bologna, Italy; [email protected] (S.S.); [email protected] (M.A.); [email protected] (F.S.V.); [email protected] (V.L.) 
 Department of Medical and Surgical Sciences, University of Bologna, 40126 Bologna, Italy; [email protected] (S.S.); [email protected] (M.A.); [email protected] (F.S.V.); [email protected] (V.L.) 
 Department of Medical and Surgical Sciences, University of Bologna, 40126 Bologna, Italy; [email protected] (S.S.); [email protected] (M.A.); [email protected] (F.S.V.); [email protected] (V.L.), Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY 11794, USA 
 Department of Medical and Surgical Sciences, University of Bologna, 40126 Bologna, Italy; [email protected] (S.S.); [email protected] (M.A.); [email protected] (F.S.V.); [email protected] (V.L.), IRCCS Azienda Ospedaliero-Universitaria di Bologna—Policlinico di Sant’Orsola, 40138 Bologna, Italy 
 Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, Unit of Occupational Health and Industrial Hygiene, University of Brescia, 25121 Brescia, Italy; [email protected] (G.D.P.); [email protected] (E.S.) 
 Unit of Occupational Medicine, University of Trieste, 34127 Trieste, Italy; [email protected] (M.M.); [email protected] (F.R.) 
 Section of Occupational Medicine, Department of Diagnostics and Public Health, University of Verona, 37134 Verona, Italy; [email protected], Occupational Medicine Unit, University Hospital of Verona, 37134 Verona, Italy; [email protected] 
 Occupational Medicine Unit, University Hospital of Verona, 37134 Verona, Italy; [email protected] 
 Interdisciplinary Department of Medicine, University of Bari, 70121 Bari, Italy; [email protected] (L.V.); [email protected] (L.D.M.) 
10  Unitat de Suport a la Recerca Metropolitana Nord, Institut Universitari d’Investigació en Atenció Primària Jordi Gol (IDIAP Jordi Gol), Mare de Déu de Guadalupe, 2, 08303 Mataró, Spain; [email protected] (P.T.-M.); [email protected] (C.V.), Germans Trias i Pujol Research Institute (IGTP), Ctra de Can Ruti, Camí de les Escoles s/n Street, 08916 Badalona, Spain, Department of Medicine, Faculty of Medicine, Universitat de Girona, Emili Grahit, 77, 17071 Girona, Spain, Multidisciplinary Research Group in Health and Society (GREMSAS) (2021-SGR-0148), Institut Universitari d’Investigació en Atenció Primària Jordi Gol (IDIAPJGol), Mare de Déu de Guadalupe, 2, 08303 Barcelona, Spain 
11  Unitat de Suport a la Recerca Metropolitana Nord, Institut Universitari d’Investigació en Atenció Primària Jordi Gol (IDIAP Jordi Gol), Mare de Déu de Guadalupe, 2, 08303 Mataró, Spain; [email protected] (P.T.-M.); [email protected] (C.V.), Germans Trias i Pujol Research Institute (IGTP), Ctra de Can Ruti, Camí de les Escoles s/n Street, 08916 Badalona, Spain, Grup de REcerca en Impacte de les Malalties Cròniques i les seves Trajectòries (GRIMTra) (2021 SGR 01537), Institut Universitari d’Investigació en Atenció Primària Jordi Gol (IDIAPJGol), Mare de Déu de Guadalupe, 2, 08303 Barcelona, Spain, Immunology Department, FOCIS Center of Excellence, Universitat Autnoma de Barcelona, Plaça Cívica, 1, 08913 Cerdanyola del Vallès, Spain, Immunology Division, Laboratori Clinic Metropolitana Nord (LCMN), Hospital Universitari Germans Trias i Pujol, Carretera del Canyet s/n, 08916 Badalona, Spain, Department of Medicine, Universitat Autònoma de Barcelona, PlaÇa Civica, 1, 08193 Cerdanyola de Vallès, Spain, Red de Investigación en Cronicidad, Atención Primaria y Prevención y Promoción de la Salut (RICAPPS), Instituto de Salud Carlos III (ISCIII), Avenida Monforte de Lemos, 5, 28029 Madrid, Spain 
12  Occupational Health Department, Regional Authority of Public Health, 97556 Banská Bystrica, Slovakia; [email protected], Faculty of Health, Catholic University, 03401 Ružomberok, Slovakia 
13  Epidemiology Department, Regional Authority of Public Health, 97556 Banská Bystrica, Slovakia; [email protected] 
14  National Institute of Public Health, 050463 Bucharest, Romania; [email protected] (V.C.); [email protected] (A.N.) 
First page
611
Publication year
2025
Publication date
2025
Publisher
MDPI AG
e-ISSN
2076393X
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3223945616
Copyright
© 2025 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.