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SARS-CoV-2 IgM/IgG antibodies serum results detected using the rapid serological test and the ELISA test after urea dissociation in sera positive on both methods. At the final evaluation, only 2 patients were considered definitely positive, as confirmed by the ELISA test after urea dissociation. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
