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(A) Difference in viral cycle threshold (Ct) value between asymptomatic individuals with positive (black) and negative (red) RAT among real-time RT-PCR-positive (n = 73). Analysis for statistical difference was performed by Wilcoxon test. (B) Plot of K-means clustering results of NSS real-time RT-PCR Ct values used to compare to RAT (black dots: RAT+/red dots: RAT−).
