The Jonckheere test showed a significant trend in the IgM and IgG index data, revealing that in COVID-19 cases the median IgM and IgG index values move in the same direction with the disease duration (IgM index value: J =781.5, Z=2.88, r=0.36; IgG index value: J=654, Z =1.16, r=0.15).
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The Performance of SARS-CoV-2 Serology Testing in the Diagnosis of COVID-19.
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