Table 1.

Characteristics and findings of the individuals included in the study.

Characteristic	Previous COVID with detectable IgG anti-Spike. Group 1; n = 674	Previous COVID with negative IgG anti-Spike. Group 2; n = 200	Vaccinated donors Group 3; n = 47
Age, years (median, IQR)∗	41 (32–54)	43 (34–56)	42 (36–57)
Sex, female (%)∗∗∗	59	55	62
Days from symptoms onset to sampling, days (median, IQR)∗∗	41 (24–62)	30 (10–49)	NA
False HIV ELISA results	12	0	0
Self-reported comorbidities (%)	Hypothyroidism (4.6%) HTN (11.7%) Asthma (2.8%) Obesity (7.8%) Diabetes (4.7%)	Hypothyroidism (3.5%) HTN (13.5%) Asthma (3%) Obesity (8.5%) Diabetes (5.5%)	Hypothyroidism (8.5%) HTN (6.4%) Asthma (2.1%)
Complications of COVID-19 (%)	Pneumonia (18.5%) Mechanical respiratory assistance (2.2%)	Pneumonia (17%)	NA

HTN, arterial hypertension; NA, not applicable.

^∗P = 0.1024, ^∗∗P = <0.0001; ^∗∗∗P = 0.4.