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Total viral copies in nasopharyngeal swab versus saliva. (A) RNAse P gene in all samples; (B) N1 in SARS-CoV-2-positive samples; (C) N2 in SARS-CoV-2-positive samples. RNAse P had significantly higher copies in saliva than nasopharyngeal swab; p < 0.00001 (Mann–Whitney U-test).
