Table 1.

Average RT-PCR CT Values of SARS-CoV-2 at Serial Dilutions

Probe	CT Value (Mean ± SD, n = 3)
	10TCID50	1TCID50	0.1TCID50	0.01TCID50	0.001TCID50
ORF 1ab	24.34 ± 0.10	27.47 ± 0.08	30.45 ± 0.78	38.1 ± 1.33	Negative
N-gene	23.84 ± 0.17	27.26 ± 0.92	30.34 ± 0.84	37.95 ± 1.28	Negative

CT, cycle threshold; RT-PCR, real-time polymerase chain reaction; TCID50, 50% tissue culture infectious dose.