Table 2.

Antigen test results versus viral culture stratified by viral load bins

Viral load bin (genome copies/mL)	n	Sensitivity	95% CI	Specificity	95% CI
LumiraDx
108–1010	23	1.00	0.85–1.00	0.00	0.00–0.95
107 to <108	43	1.00	0.91–1.00	0.00	0.00–0.56
106 to <107	34	0.93	0.77–0.99	0.00	0.00–0.39
105 to <106	29	0.72	0.49–0.88	0.55	0.28–0.79
104 to <105	23	0.00	0.00–0.56	0.70	0.48–0.85
103 to <104	18	N.D.		0.94	0.74–1.000
<103	19	N.D.		1.00	0.83–1.00
BD Veritor
108–1010	23	1.00	0.85–1.00	0.00	0.00–0.95
107 to <108	43	1.00	0.91–1.00	0.33	0.02–0.88
106 to <107	33	0.63	0.44–0.78	0.67	0.30–0.94
105 to <106	29	0.28	0.13–0.51	1.00	0.74–1.00
104 to <105	22	0.000	0.00–0.56	0.95	0.75–1.00
103 to <104	18	N.D.		1.00	0.82–1.00
<103	19	N.D.		1.00	0.83–1.00
CareStart
108–1010	22	1.00	0.85–1.00	0.00	0.00–0.95
107 to <108	43	1.00	0.91–1.00	0.00	0.00–0.56
106 to <107	33	0.63	0.44–0.78	0.50	0.19–0.81
105 to <106	27	0.13	0.02–0.36	1.00	0.74–1.00
104 to <105	22	0.00	0.00–0.56	1.00	0.83–1.00
103 to <104	18	N.D.		1.00	0.82–1.00
<103	19	N.D.		1.00	0.83–1.00
Oscar Corona
108–1010	21	1.00	0.84–1.00	0.00	0.00–0.95
107 to <108	40	1.00	0.91–1.00	0.00	0.00–0.56
106 to <107	32	0.65	0.46–0.81	0.67	0.30–0.94
105 to <106	25	0.07	0.00–0.31	1.00	0.74–1.00
104 to <105	22	0.00	0.00–0.56	1.00	0.83–1.00
103 to <104	17	N.D.		1.00	0.82–1.00
<103	19	N.D.		1.00	0.83–1.00

N.D., not defined as there are no false negatives and true positives.