[Source: Vaccines (Basel), full page: (LINK). Abstract, edited.]
SARS-CoV-2 Infection Is Asymptomatic in Nearly Half of Adults with Robust Anti-Spike Protein Receptor-Binding Domain Antibody Response
by Ourania E. Tsitsilonis 1,*,† , Dimitrios Paraskevis 2,*,† , Evi Lianidou 3 , Evangelos Terpos 4 , Athanasios Akalestos 5, Vassilios Pierros 6, Evangelia Georgia Kostaki 2 , Efstathios Kastritis 4, Paraskevi Moutsatsou 7, Marianna Politou 8, Andreas Scorilas 1, Thomas Sphicopoulos 6, Nikolaos Thomaidis 3 , Ioannis P. Trougakos 1 , Athanassios Tsakris 9, Nikolaos Voulgaris 10, Christina C. Daskalaki 1, Zoi Evangelakou 1, Christina Fouki 2, Despoina D. Gianniou 1 , Sentiljana Gumeni 1, Ioannis V. Kostopoulos 1 , Maria S. Manola 1 , Nikolaos Orologas-Stavrou 1, Chrysanthi Panteli 1, Eleni-Dimitra Papanagnou 1 , Pantelis Rousakis 1, Aimilia D. Sklirou 1 , Stavroula Smilkou 3 , Dimitra Stergiopoulou 3, Sotirios Tsiodras 11 , Meletios-Athanasios Dimopoulos 4 and Petros P. Sfikakis 12
1 Department of Biology, National and Kapodistrian University of Athens (NKUA), 15784 Athens, Greece; 2 Department of Hygiene, Epidemiology and Medical Statistics, School of Medicine, NKUA, 11527 Athens, Greece; 3 Department of Chemistry, NKUA, 15771 Athens, Greece; 4 Department of Clinical Therapeutics, School of Medicine, Alexandra General Hospital, NKUA, 11528 Athens, Greece; 5 Roche Diagnostics (Hellas) S.A., Marousi, 15125 Athens, Greece; 6 Department of Informatics and Telecommunications, NKUA, 15784 Athens, Greece; 7 Department of Clinical Biochemistry, School of Medicine, University General Hospital Attikon, NKUA, 12462 Haidari, Greece; 8 Hematology Laboratory-Blood Bank, Aretaieio Hospital, School of Medicine, NKUA, 11528 Athens, Greece; 9 Department of Microbiology, School of Medicine, NKUA, 11527 Athens, Greece; 10 Department of Geology and Geoenvironment, NKUA, 15784 Athens, Greece; 11 Fourth Department of Internal Medicine, School of Medicine, University Hospital Attikon, NKUA, 12462 Haidari, Greece; 12 First Department of Propaedeutic Internal Medicine, School of Medicine, Laiko General Hospital, NKUA, 15772 Athens, Greece
*Authors to whom correspondence should be addressed.
†The authors contributed equally.
Academic Editor: Steven B. Bradfute
Vaccines 2021, 9(3), 207; https://doi.org/10.3390/vaccines9030207 (registering DOI)
Received: 6 January 2021 / Revised: 13 February 2021 / Accepted: 16 February 2021 / Published: 2 March 2021
(This article belongs to the Special Issue SARS-CoV-2 Serological Studies around the Globe)
Abstract
Between June and November 2020, we assessed plasma antibodies against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) nucleocapsid protein in 4996 participants (aged 18–82 years, 34.5% men) from the National and Kapodistrian University of Athens. The weighted overall prevalence was 1.6% and monthly prevalence correlated with viral RNA-confirmed SARS-CoV-2 infections in Greece, in the same period. Notably, 49% of seropositive cases reported no history of SARS-CoV-2 infection-related clinical symptoms and 33% were unsuspected of their previous infection. Additionally, levels of anti-SARS-CoV-2 antibodies against the spike-protein receptor-binding domain were similar between symptomatic and asymptomatic individuals, irrespective of age and gender. Using Food and Drug Administration Emergency Use Authorization-approved assays, these results support the need for such studies on pandemic evaluation and highlight the development of robust humoral immune responses even among asymptomatic individuals. The high percentage of unsuspected/asymptomatic active cases, which may contribute to community transmission for more days than that of cases who are aware and self-isolate, underscores the necessity of measures across the population for the efficient control of the pandemic.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
Tsitsilonis, O.E.; Paraskevis, D.; Lianidou, E.; Terpos, E.; Akalestos, A.; Pierros, V.; Kostaki, E.G.; Kastritis, E.; Moutsatsou, P.; Politou, M.; Scorilas, A.; Sphicopoulos, T.; Thomaidis, N.; Trougakos, I.P.; Tsakris, A.; Voulgaris, N.; Daskalaki, C.C.; Evangelakou, Z.; Fouki, C.; Gianniou, D.D.; Gumeni, S.; Kostopoulos, I.V.; Manola, M.S.; Orologas-Stavrou, N.; Panteli, C.; Papanagnou, E.-D.; Rousakis, P.; Sklirou, A.D.; Smilkou, S.; Stergiopoulou, D.; Tsiodras, S.; Dimopoulos, M.-A.; Sfikakis, P.P. SARS-CoV-2 Infection Is Asymptomatic in Nearly Half of Adults with Robust Anti-Spike Protein Receptor-Binding Domain Antibody Response. Vaccines 2021, 9, 207. https://doi.org/10.3390/vaccines9030207
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Keywords: SARS-CoV-2; COVID-19; Serology; Seroprevalence; Greece.
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