Fig. 4

Matched patients swab and saliva viral genes. Scatter plots of Ct values of ORF, N and S genes in patients whose swab and saliva were positive. Panel A; Ct values of the three genes in all the patients, Panel B; Ct values of three genes in asymptomatic patients, Panel C; Ct values of three genes in symptomatic patients. X axis represents Ct values of N, ORF, S genes and Y axis represents the number of patients. Ct values of the 3 genes did not show any significant difference in asymptomatic patients, while in symptomatic patients, Ct values of the ORF (p = 0.002) and S (p = 0.0007) genes were significantly lower in swabs than saliva samples, while the N gene had no significant difference