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Fig. 1 | BMC Infectious Diseases

Fig. 1

From: Estimating asymptomatic SARS-CoV-2 infections in a geographic area of low disease incidence

Fig. 1

Serum SARS-CoV-2 IgG in asymptomatic healthy volunteers (HV, blue dots) and symptomatic patients (SP, red dots). In four HV, IgG were measured at day 1 (d1) and day 30 (d30). Box plot of HV d1 refers to 381 subjects with SARS-CoV-2 IgG levels below the positivity threshold. The yellow dot indicates the IgG levels in a paucisymptomatic patient (only showing anosmia) that had been positive for the presence of SARS-CoV-2 in nasopharyngeal swab, but was negative at the moment of blood sampling. The difference between the HV IgG values above 11 Units (blue dots) and HV IgG values below the threshold was significant (p = 7.80853*10− 6). The difference between the HV IgG values above 11 Units and SP is less significant (p = 0.002063)

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