Figure.

Standard curves drawn from papers providing serial dilution factors and corresponding Ct in patient samples

All Ct values were derived from clinical samples targeting RdRp/Orf1b sequence of SARS-CoV-2. Ct=cycle threshold. RdRp=RNA-dependent RNA polymerase. SARS-CoV-2=severe acute respiratory syndrome coronavirus 2. *Ct values provided in the figure 1 legend were used. †Ct values of Orf1b in patient 2 provided in table 1 were used. ‡Ct values of RdRp in test 2 of clinical specimen were used.