Re-evaluating positive serum samples for SARS-CoV-2-specific IgA and IgG antibodies using an in-house serological assay

This letter takes a cue from a recently published study, which looked at diagnostic tests currently available for SARS-CoV-2 infection, to present and discuss the results of a re-evaluation of 122 positive serum samples from COVID-19 patients using an in-house serological assay for SARSCoV-2 antibodies detection. While serology targeting the SARS-CoV-2 S protein should be preferable, IgA testing is proposed in all situations for which serology is the solely practicable diagnostic strategy for SARSCoV-2 infection.