Table 2.

Sensitivity of Standard TM Q COVID-19 Ag (SD Biosensor® Republic Korea) in subgroups in different severity of illness categories.

	Ct Value	Mean Ct Value	Standard TM Q COVID-19 Ag positive	Standard TM Q COVID-19 Ag negative	Sensitivity %
Asymptomatic	Ct [20.3–28.2]	26.25	11	0	59.32
	Ct [34.7 – 39.]	36.84	0	24
Mildillness	Ct [8.24–30.21]	21.96	4	0	54.54
	Ct [30.08–38.0]	34.37	0	20
Moderate illness	Ct [12.51–29.42]	22.7	10	0	69.23
	Ct [34.08–38.2]	35.43	0	8
Severe illness	Ct [11.3–30.5]	18.92	13	0	80.95
	Ct [30.5–36.2]	33.17	0	4