Table 2.

Determination of NP in diluted human serum samples.

Serum Sample		Initial (pg/mL)	Added (pg/mL)	Found (pg/mL)	Recovery (%)
Healthy	1*	–	1	1.04 ± 0.03	103.9
	2*	–	5	4.87 ± 0.22	97.4
	3*	–	10	10.81 ± 0.69	108.1
	4*	–	50	49.25 ± 1.72	98.4
	5#	–	1	1.06 ± 0.06	106.3
	6#	–	5	5.11 ± 0.18	102.3
	7#	–	10	10.94 ± 0.55	109.4
	8#	–	50	52.35 ± 1.26	104.7
COVID-19 Patient	1*	5.15 ± 0.34	10	14.47 ± 0.34	95.5
	2*	1.85 ± 0.12	10	12.37 ± 0.44	104.5
	3*	27.59 ± 1.42	10	40.07 ± 2.53	106.6
	4*	5.28 ± 0.33	10	16.42 ± 0.46	107.5
	5#	37.05 ± 0.96	10	42.85 ± 1.34	91.1
	6#	129.8 ± 4.04	10	146.5 ± 3.72	104.8

“-”: undetectable

“*”: 100-fold diluted; “#”: 20-fold diluted