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Evaluation of sensitivity and specificity of rS-based IgG (A) and IgM (B) antibody ELISA for SARS-CoV pneumonia. Serum specimens were obtained from 95 patients with SARS-CoV pneumonia, and control serum specimens were obtained from 148 healthy blood donors. The test results were plotted as OD450 values. The cutoff line for positive diagnosis is drawn at a value that equals the sum of the mean value and two times the standard deviation for the healthy blood donors.
