Fig. 2.

Detection of SARS-CoV-2 using saliva and gargle, compared to the NS. (A) True-positive rate (TPR) of saliva and gargle samples in comparison to NS. Two positive patients in saliva and gargle but negative in the NS were removed from this plot. Percentages are related to positive (below) or positive + inconclusive (above) TPR values. Inconclusive results, according to kit manufacturer instructions, render only amplification of the N gene target. (B) Paired ORF-1ab target comparison between NS, saliva, and gargle. P-values derived from paired t test. Correlation between ORF-1ab Ct values from NS and saliva (C), NS and gargle (D), and gargle and saliva (E). Gray areas represent undetermined Ct values, which are the values represented in both axes. Pearson's correlation and derived P-values were calculated excluding undetermined samples (lower-left corner in shaded area). Ct = cycle threshold; NS = nasopharyngeal swab.