Table 2.

Characteristics of the subjects included in the study.

		Not infected (protected)	Infected (unprotected)
	Total (51)	(n = 27)	(n = 24)
Sex (N°)
M	20	11	9
F	32	16	16
Age (years)
Mean ± SD	37.6 ± 10.6	36.5 ± 10.1	38.9 ± 10.9
Range	26–63	26–63	26–62
Time from serum collection to diagnosis of infection (days)
Mean ± SD			13.3 ± 5.1
Range			6–21
Smoking	5	3	2
BMI	23.4 ± 2.5	23.4 ± 2.4	23.3 ± 1.7
Symptoms (N° of patients)
Fever			14
Cough			10
Rhinorrhea			5
Headache			11
Anosmia			12
Ageusia			11
Asthenia			10
Myalgia/Arthralgia			6
Other symptoms			13
Asymptomatic			4
Symptomatic			20