Table 1.

Characteristics of the subjects included in the pilot study

Subject number	Group	Symptoms	Nasopharyngeal swab	Serological testing	Ct values (N1)	Ct values (IP2)
1	SUSP	Mild	Negative	Negative	ND	35,78
2	SUSP	Mild	Negative	Negative	ND	35,71
3	POS	Present	Positive	Positive	ND	37,28
4	POS	Present	Positive	Positive	ND	41,07
5	POS	Present	Positive	Positive	ND	33,37
6	POS	Present	Positive	Negative	36,19	34,73
7	POS	Present	Positive	Positive	ND	32,69
8	CTRL	Absent	Negative	Negative	ND	37,25
9	CTRL	Absent	Negative	Negative	ND	ND
10	CTRL	Absent	Negative	Negative	ND	ND
11	CTRL	Absent	Negative	Negative	ND	ND
12	CTRL	Absent	Negative	Negative	ND	ND

POS subjects with previous diagnosis of SARS-CoV-2 infection and healed at the time of sampling, SUSP individual contact with a subject with diagnosis of SARS-CoV-2 infection who developed mild symptoms, CTRL subjects who denied both contacts with positive subjects and symptoms, N1 primers and probes for PCR amplification of the N gene 28287–28358* (US Centers for Disease Control and Prevention CDC, USA), IP2 primers and probes for PCR amplification of the RdRp gene 12690–12797*, (Institute Pasteur, Paris), ND not detectable

Nucleotide numbering based on Wuhan-Hu-1 GenBank MN908997