Table 2.

Sensitivity and antibodies levels of ELISA (QuantiVac ELISA IgG, Euroimmun) and Maglumi (IgG anti-RBD, SNIBE) methods in the different patient’s specimens subdivided in time frames according to the day from the onset of symptoms.

		Positivity Rate		ELISA Levels (RU/mL)			Maglumi Levels (AU/mL)
Days from Symptoms’ Onset	n of Specimens	ELISA	Maglumi	25 Percentile	Median	75 Percentile	25 Percentile	Median	75 Percentile
≤11 *	17	41.2%	76.5%	2.4	10.3	37.1	1.0	3.1	14.1
12–16 *	15	73.3%	80.0%	6.7	68.1	404.0	2.3	24.9	50.6
17–22	14	100.0%	100.0%	76.8	191.5	438.0	25.6	48.8	58.1
23–43	16	100.0%	100.0%	137.5	250.5	448.5	43.2	50.5	61.5
46–72	15	100.0%	100.0%	183.2	259.2	330.2	49.8	82.7	126.0
81–162 *	16	93.7%	100.0%	57.8	102.6	149.0	23.1	34.6	53.1
168–371 *	15	86.7%	100.0%	29.4	39.6	110.3	13.9	22.2	48.1

Asterisks represent the classes of cases significantly different from that with higher concentrations.