Table 1.

Classification of rRT-PCR results according to the Ct value.

rRT-PCR	Negative	Positive
		Total	Ct < 20	20 ≤ Ct < 25	25 ≤ Ct < 40
SARS-CoV-2	489	485	175	127	183
FluA	574	400	169	151	80
FluB	948	26	7	9	10

Abbreviations: Ct, cycle threshold; FluA, influenza A virus; FluB, influenza B virus; rRT-PCR, real-time reverse-transcription polymerase chain reaction; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.