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Ct values in nasopharyngeal, saliva, and oral specimens for genes N1, N2 and cellular control for center 2 (A). Ct values in nasopharyngeal, saliva, and oral specimens for genes N, S, and ORF1 center for center 3 (B). ns not significant, * p < 5%, ** p < 1%, *** p < 0.1%, **** p < 0.01%
