TABLE 4.

Sensitivity of Ag rapid FIA and Ag Gold determined by days post-symptom onset.

Days post-symptom onset	Ct-value (mean ± SD)	N	Positive	Negative	Sensitivity (%)	95% CI (%)
Ag rapid FIA
−2–3	24.94 ± 5.72	21	15	6	71.43%	47.82–88.72
4–7	27.47 ± 4.45	24	15	9	62.50%	40.59–81.20
8–14	33.41 ± 3.78	13	6	7	46.15%	19.22–74.87
>14	34.9 ± 2.86	5	2	3	40.00%	5.27–85.34
Ag Gold
−2–3	24.52 ± 5.80	18	14	4	77.78%	52.36–93.59
4–7	27.41 ± 4.86	19	7	12	36.84%	16.29–61.64
8–14	33.25 ± 3.90	12	2	10	16.67%	2.09–48.41
>14	34.90 ± 2.86	5	0	5	0.00%	0.00–52.18