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AI of SARS-CoV-2 IgM detected using different urea dissociation concentrations of ELISA. When the dissociation concentration of urea was 4 mol/liter and the AI calculation method value was set to 0.371, the results determined for SARS-CoV-2 IgM in 19 sera with RF-IgM positivity turned negative, whereas the results determined for SARS-CoV-2 IgM in the 14 sera from COVID-19 patients remained positive.
