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Editor-in-chief
Maria Stella Graziani

Deputy Director
Martina Zaninotto

Associate Editors
Ferruccio Ceriotti
Davide Giavarina
Bruna Lo Sasso
Giampaolo Merlini
Martina Montagnana
Andrea Mosca
Paola Pezzati
Rossella Tomaiuolo
Matteo Vidali

EIC Assistant
Francesco Busardò

International Advisory Board Khosrow Adeli Canada
Sergio Bernardini Italy
Marcello Ciaccio Italy
Eleftherios Diamandis Canada
Philippe Gillery France
Kjell Grankvist Sweden
Hans Jacobs The Netherlands
Eric Kilpatrick UK
Magdalena Krintus Poland
Giuseppe Lippi Italy
Mario Plebani Italy
Sverre Sandberg Norway
Ana-Maria Simundic Croatia
Tommaso Trenti Italy
Cas Weykamp The Netherlands
Maria Willrich USA
Paul Yip Canada


Publisher
Biomedia srl
Via L. Temolo 4, 20126 Milano

Responsible Editor
Giuseppe Agosta

Editorial Secretary
Chiara Riva
Biomedia srl
Via L. Temolo 4, 20126 Milano
Tel. 0245498282
email: biochimica.clinica@sibioc.it

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ISSN print: 0393 – 0564
ISSN digital: 0392- 7091



BC: Articoli scritti da E. Berti

Antibody identification in COVID-19 pandemic: a comparison between immunochemiluminescence and immunochromatography methods
<p>Introduction: in the fight against the COVID-19 pandemic, the determination of the serum antibodies against SARS-CoV-2 is highly relevant, although the reliability of the results delivered is sometimes questionable. The aim of this paper is to evaluate the performances of a rapid immunochromatography test for IgG and IgM antibodies, comparing them with an immunochemiluminescence method.<br />Methods: we analyzed 357 sera for the presence of IgG anti-SARS-CoV-2 spike proteins S1/S2 with an automated immunochemiluminescent test (DiaSorin&reg;) and the presence of IgG and IgM anti-SARS-CoV-2 nucleocapside protein with an immunochromatography method (LEPU&reg;) based on lateral flow technology.<br />Results: with Diasorin&reg; method, 248 subjects resulted to be negative and 109 positives, whereas LEPU&reg; test was positive (IgM+ and/or IgG+) in 98 subjects. The overall concordance between LEPU&reg; and DiaSorin&reg;, was 94.1% (95% CI 91.0-96.2). Cohen&rsquo;s kappa was 0.86 (95% CI 0.80-0.92), indicating good agreement. 21 out of 357 (5.9%) samples had a discordant result and were re-analyzed with a third method (Roche Diagnostics Electrochemiluminescence&reg;): 4 out of 5 DiaSorin&reg; negative/LEPU&reg; positive samples were confirmed as negative by Roche&reg;; conversely, among the 16 DiaSorin&reg; positive/LEPU&reg; negative samples, 5 were confirmed as positive by Roche&reg;, 6 as negative and 5 were not retested due to insufficient sample volume.<br />Conclusions: despite the methods were designed to detect different antibodies an overall high agreement between techniques was found. Discrepant results were found and were likely due to different antigen targets recognized by methods. The observation that only 6 out of 11 DiaSorin&reg; positive samples were not confirmed by ROCHE&reg;, supports the antigen-dependent hypothesis.</p>
Biochimica Clinica ; 45(2) 153-157
Contributi Scientifici - Scientific Papers