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Scatterplot of viral copies/mL (log10) by reverse-transcription polymerase chain reaction (RT-PCR) and cycle threshold (Ct) value by Xpert® Xpress Flu/RSV (point-of-care test). Black diamond dots are tested positive with both assays. Crosses indicate discordant test results. Dots below the horizontal or left of the vertical lines are undetectable by 1 of the assays. The blue line shows the regression line with confidence interval (gray shadow).
